Holy First of the Golden Uterus

Does anyone else know of adults who grew up to be just as bad or worse than the GUBM that birthed them? Like the golden uterus has bestowed magical properties on them so they must be honored and given extra resources because they were the FIRST.

My DH has a toxic half sister from his father's first marriage. They are not close but she acknowledges him as a brother and they talk once in a while. My H also has twin sisters with the same mom.

Half-sister (HS) thinks of herself as the only legitimate child since she was the first and has an attitude when she thinks any of the other siblings are treated better than her. She used her first status to turn FILs mother against the rest of he grandchildren. She was jealous when FIL paid for the other kid's college when she herself got more money for her own college then dropped out before finishing her program. HS wanted to go back to school at the same time as one of the younger siblings because she couldn't stand the idea of FIL paying money for someone other than her. FIL refused to pay for her since he already sent her to school and she squandered it (go FIL!). She also became jealous when one of the younger sisters got married and demanded FIL co-sign a car loan for her. How dare he pay for a wedding for her younger sister without giving her something just as large! He actually agreed to this and she didn't pay the loan and ruined his credit (d'oh FIL!). FIL goes to visit her but she never visits him.

HS is in more contact around the holidays because she is nosey as to what everyone else is getting from their father. She will call all the siblings and interrogate them about what they are getting from FIL (not just for Christmas but in life) and then call the next one and try to turn them against each other and bitch about FILs favoritism. DH and SILs try to involve HS in their life events but she can't be bothered to participate or include them in her life, however if they ever forget to include her she will play the victim. All of her relationships are very one sided, probably why she is still single.

She continues to punish FIL because he wouldn't pay for her 35 year old ass to go back to school or give in to her other demands. She wants money from him but treats him spitefully like she is owed for existing. The other kids return affection to FIL and because of that he is closer to them! FIL does prefer his youngest kid to HS but that's because his youngest kid is NICE TO HIM. FIL doesn't want to deal with HS's attitude and her "punishing" him for having a second family and not giving in to everything she wants.

I foresee my SD12 growing up to be just like this. She is already very materialistic and has a transactional relationship with my DH. I hope he can stand up to her demands as she gets older! So far SD12 talks positively about baby DD but it's really just to suck up to DH. When it comes to actually interacting with her half sister she has no interest at all.