hmmmm! i really like the sound of that. i feel like rn she's got something in her background like... maybe she was the product of an affair outside marriage, so probably she was/is very estranged from her half-siblings, maybe didn't really connect until they were much older adults, so she would have only met your girl and her siblings when they were older vs. when they were little kids, and she would have been this like. big, bombastic wine aunt personality, like "haha hey kids love me love me love me let me buy you presents please :(" because she'd really want to become a part of the family. it would be up to you whether she'd be on her mom or dad's side of the family--i feel like if elsie's dad is like, a senator and a lobbyist and maybe comes from a political family, she'd be the skeleton in the family closet lmao. it's your family setup so you let me know what works!