Note: it doesn't work to preserve active occult bloodlines, and as such I have to change all of Angel's ancestors to be aliens. I've also cheated everyone's parents to be alive and rolled 1d4-1 for the number of siblings they have, creating them with Play With Genetics on the active Sim to create siblings
Manda Wilson:
She gains siblings Cayden, Troylen, and Jimar.
The Somersets:
Conway gains siblings Ricardo and Miguel. Poppy gains siblings Kichawi, Axton, and Amberra.
The Uha-Thornes:
Shalott is an only child. Paka'a gains siblings Wana'ao, Rainbow Mist, and Mokihana.
The Candelaria-Mendez-Sutton-Fausts:
Indigo gains sibling Saguara. Jalisa gains siblings Kelia and Casey. Mae gains siblings Elise and Vivienne. Ulrike is an only child.
The Softs:
Weston gains siblings Matthew and Hailey, Angel gains siblings Ultra and Skin-So. (Ultra is a twin.)