MIL Easter advice HELP!!!

Okay so a little quick back story, I moved in the town I’m in with my father when my parents divorced, so the only family I have in this town is my dad whom I’m not close with anymore because of my stepmom I’m 26 and I’ve been on my own moved out of my dads house since I was 17 I left and never went back due to an evilstep mother, IVE TRIED to be close with her over the years and it’s just never worked out she’s always treated me like an ugly duckling because she just wants everything to be about my little sis whom she had with my dad and she can’t stand my mom, like she would always go out of her way to make it known I was not her child and she is from the town we’re in so she has nothing but family here but she’s never ever made me feel like I’m part of her family hell her mom is even mean as fuck to my dad and my just don’t care cause he loves her so much and is such a pushover mind you she’s a whole 10 years ginger then my dad, she got with my dad when she was 26 and my dad was 36 and she has it made with my dad so it’s always been hard to keep a relationship with my dad because she is always all shit face anytime I’m around and my dads giving me or his grand kids attention (I have 2 kids) so that being said, she is not family oriented when it comes to my dads grandkids or I she is all about HER family and that’s it.

Okay now my mom, she has bipolar and all kinds of other things wrong with her such as loyalty issues like when something don’t go her way when we’re just talking over the phone she then starts yelling saying “your a spawn of satan and your the devil” and all kinds of other bullshit so I don’t even care to communicate with her I have 2 baby’s dads and my son is 7 I left his dad when he was 1 and I’ve been with my daughters dad ever since, I’ve always given her the benefit of the doubt because I look at it as “she’s my mom” and she still always lets me down like she talks to my sons dads girlfriend about me like why do they even talk on the phone, she calls to talk to my son when he’s with his dad, mind you I have my son ALL the time and she is always calling my phone day in and day out she just rather call the two weekends out of the month when he’s with his dad to talk to my son. My sons dad has told me a million times that my mom talks shit about me this and that when I tell him quit talking to her he says well it’s for our son, which it ain’t for our son if she’s talking about me. When I bring it up to her she Denys Denys and starts screaming saying he’s lying and I’m lying and all this other bullshit. She only cares about my son which is so weird because we went to her house a few weeks back and there were pictures GALORE or my son! ONLY MY SON, blown up pictures everywhere, like everywhere weirdo obsessed and I say that because I have a 3 year old daughter whom my mom acts like she cares about and there was not 1 picture of her anywhere and she also has 2 grandkids from my brother and there was not 1 picture of his 2 kids up and she has 2 step grandkids and she even had a little section in her house for them, not of my daughter or my brothers kids... weird right??? So i didint come from the most stable family, and I don’t have family to offer my kids just me and my SO side, and that’s where they come in.

My M-I-L IS JUST LIKE MY MOM!!! just alike I swear, my SO has a son prior to me just like I have a son prior to him, and he is all she cares about she does not care about our daughter she is always trying to compare the two! When there brother and sister for crying out loud, she does not like my son she is so jealous of my son and her own granddaughter because she says it’s not fair that my kids get to be with him everyday and his son dosent (mind you, his baby mama has custody) she’s always looking for a way to compare the kids and she always goes out of her way to do more for her grandson then our daughter who is the baby of the family she has her 1st granddaughter who is 14, my stepson who is 8 and my daughter jus turned 3, she has done so many evil things to me and has said so many mest up things about me to all of his family to his baby mama and etc etc. she even spreaded a little rumor in the family saying I didint believe in god!!!!! Like wtf!??? She always fronts like she is this obedient Christian women but she is far from okay, so I have always been the type like I don’t need the extra drama in my life and his mom has ALWAYS tried to make it impossible for us to be togeather she will tell him “don’t you wanna be with someone your family likes” etc etc and he will stop talking to her on his own, because he sees and knows exactly hoe his mom is, well just last month she came to my car as we had to pull up so he could pick something up, It’s been 8 months since I’ve talked to her, mind you this is nothing new I always cut her off and quit talking to her for. Shady shit and she always comes to me and acts like she is a new person and has changed and this and that and I wanna see the good in her cause it’s his mom like who wants there MIL to hate them right so I accept it and she does some shady shit alllllllllllllll over again, ex. (She was acting like she changed and was so cool with me and this and that, but she was really twisting everything around telling his baby mama EVERYTHING she could find out about me but was twisting it around like saying I think I’m better then everyone because I prefer oraganic for my kids, or because I’m selective with what my children watch on television she said I’m weird and don’t let my kids do shit) well she recently came to me AGAIN, Saying that she is sorry for anything she’s ever said or done to me that is the “old her” and she’s all into church and is someone new blah blah blah, forgive her and all this, well I’ve accepted her apology cause I do believe people can change , and she sees the drama she starts which causes her own son not wanting to be around her and her not being able to see her granddaughter not that she really cares, I just feel like she is doing this because right now his bm is being her and withholding his son from him so my MIL has not seen his son at all and she has booked to occupy her time cause all she gives a shot about is his son I swear !!!! I wish I could tell you all everything else that has happened you would understand more. Well she invited us for Easter mind you my daughter has never been to her house on Easter ever! Like his mom has went so many holidays and weeks and days without even calling my daughter asking for my daughter or anything, and now for Easter she’s like oh I made her an Easter basket and your son one and blah blah blah come over make the potatoe salad! And we already said yes, but now today is a new day and I started my period yesterday, I’m thinking about the past, I’m thinking about his family that is gonna show up and I look stupid because his mom has drug my name threw the dirt to these people and she may still be doing it behind my back and I just look dumb, my SO brother and sister love our daughter and they live there it’s just his mom that’s the master mind of everything and I don’t really wanna go, I know it’s not for me or for him it’s for our daughter but given the back story would you go? I know we said yes and there expecting us, but I know if his son was able to go and his bm was dropping him off to his mom she wouldn’t even dare to call us or invite us. But then again we’re right on money and can’t do much for our daughter here at home we live in little apartments and I don’t have family to offer my daughter luckily my son is having a blast with his dad because it’s his year with him. But why would you guys do? Am I being petty am I wrong? Do you guys understand what I’m saying? And then me and my SO aren’t really even getting along like he said he don’t care to go because I’m gonna he all mad and it’s gonna he obvious, and I know he’s only saying that he don’t care to go because I don’t care to go. Like I know it’s all about family but when the family is more toxic then good what do you do.

Her dads just watching basketball in the living room, and I’m just in our room laying down anyway like we haven’t talked about it really I went out there after showering and I said so we’re not going and he said I guess not and stayed looking at the TV, so I’m like fuck it were supposed to be there at 12 or before 12 I ain’t ready and neither is he or our baby and I haven’t made anything and his mom is gonna be calling me and him soon, like he should tell her we’re not going right, I mean that’s HIS MOM.

I need advice, I feel for my baby girl what should we do, like I’m good with not going but depending on my advice I may be able to suck it up and fake a smile just so she can have a good Easter. ( and my baby has a broken wrist she broke it at daycare last week so she has a big go cast and has only 1 arm to use)