I could really use some support please 😭

How do I get over/deal with this?

My family my (mum & nan mostly) love my brothers 4 children but not my little one a few examples would be my mum never bothered to visit my baby ever but flew 5 hours (each way) 3 times during the first year of her life but couldn’t drive 25 mins to come see mine. We have since relocated to be where my brother lives she CONSTANTLY sends my brothers kids things from Xmas event calendars to expensive jewellery. She came over her to visit since we moved & I was told they were having a child free day (they spend all week with them as it was I at this point was only invited once anyway on the last day it was a “kid free day” that i personally confirmed about 10 times cos I thought it was a joke... later to find out ALL my brothers kids went! one is younger than my 3 year old so it’s not an age thing. I’ve pulled my mum up on this to be told bullshit & fuck off & enjoy my life. my family is horrible my mum knew about things my step dad would do and when I tried to tell her as a young teen she told me to fuck off if I was going to try “ruin her life” yet they are all normal happy lovely family when it comes to my brother! my brother recently even just cheated on his wife & had a 5th baby to a random & they love that baby the same also WTF is wrong with my kid it makes me so so so made & hurt. How do I get past this it eats me up inside! Help me please please I’ll be forever greatful! I just feel like my little one only has me & her dad my dad is good he is close with all the kids! He lives near us that’s why we moved. It also just hurts to see them all comment on their fb photos & ignore my little one I don’t get it.

Thank you if you made it this far I didn’t know where else to post 😔