Titus is dead, the game not
I may be the only one, but I can't "feel good" about transforming the dad. I mean, you only have one mother. I don't know, feels weird.
I much rather prefer showing him who's the alpha male and being the new head of the family, somewhat the same for the uncle. I loved the sleep events where you own the mother and sister in front of your father (exploring his fears). About the cousin I don't mind the transform, you can have a lot of cousins.
About the ones you mentioned, besides Jane I probably prefer Kylie.
Speaking of uncles and cousins, just a small sidenote it's funny that I feel the Hills fit quite well as cousin and aunt. I even changed the story a bit myself on Twine and it works fine (the only major difference are initial events about Jane's father, but besides that nothing special). I even used the fact of going along with Jake to mix the Brittany's events (like along with that nerd, etc).
After the latest release I somewhat got lazy to change the code again, was just a small experience. It was fun, but I completly understand G28 doesn't want to fill the game only with family characters, but actually give a decent amount of character diversity. Specially taking into account that some also like that "single mom" fetish as well. Sure Ms Wilson is the same, but fits different purpose taking into account how her events go, specially when comparing to Ms Hill.
While the bimbo stuff may fit Heather, for some reason I can't associate that with Suzie. I actually believe she's an actually nice and cute character. Specially taking into account the events with her mom.