Step sister threatening my mom and my step dad (her dad) to not see her baby every time she doesn’t get what she wants??

So I just wanted to vent about this because it’s something that’s been going on in my family.

So this is my step sister. She and I grew up together. Her mom is out of the picture, lost all custody of her. No visitation rights etc. So basically we were all raised by her dad and my mom.

So she had a baby. She’s 22. She moved in with her child’s father. He’s a dick, super controlling. Doesn’t let her see any of us unless she asks permission. So I think this is mostly him. But we don’t know for sure because he acts super nice when around all of us.

So since she had her baby (he just turned a year old) she has held the baby over her dad and my moms head every single time she doesn’t get what she wants. Let me give some examples:

- She told my mom she wanted them to get her baby diapers, a crib and a car seat for when the baby arrives. (This is the first time this happened btw) and my step dad told her there was no way they were going to able to afford all of that because he had to take a while out of work because of his back surgery. He said they could get a lot of diapers for her and a car seat but not the crib. She completely flipped out and told them they wouldn’t see her child so they gave in and got her everything (had to use their credit cards.)

- She doesn’t work so when the baby arrived she asked them to pay her house bills because her child’s father lost his job. They told her they would for 3 months which was really nice of them because I wouldn’t have. Anyways once that 3 months was up her childs father and her still didn’t have a damn job. They stopped paying the bills and she did the SAME thing. Said they don’t care for her and her family so she didn’t want them in her life. They’re STILL paying her mortgage. Fucking ridiculous and disgusting and they are using them.

- this was most recent. She’s extremely self centered. So my husband and I are newly married. We are closing on our first home in two weeks! So this Christmas me and my biological sister and my mom and step dad all agreed on coming to my new house for the day (we all went to my step sisters house for thanksgiving) since I’m closing on the house.

Well when they invited her she was LIVID. She told them she has a child and she can’t just leave and we all have to go there. They said well can we just go to your house on Christmas eve and then go to my house on Christmas since I’m closing. That wasn’t good enough for her.

My mom finally called her and told her off pretty much. She said it’s ridiculous they have spent thousands and thousands on helping them and that they were coming to me and my husbands home for Christmas. It was a huge argument between the three of them and it ended with her telling them that she was done and they would never see her baby again. So my step dad was pretty much in tears because that’s his only bio child and he will never have another grandchild.

So I told them it’s okay if they go there for Christmas that they could come over and see the house another day.

Idk I’m just really sad for them. 😕 She is so manipulative and I hate seeing my mom and step dad so stressed. Honestly if I were them I would just tell her I don’t even care to see her or her kid anymore lol but my step dad and mom are so caring they would never say that. Just needed to rant!