There's a bug with renaming characters, in 0.8 with the hotfix from Post 1 applied.
If you change the last name for the mom, it doesn't follow the rest of the family... which presumably it should as she never married "Liam". In the example below, I renamed the mom to 'Treyan' for last name.
Then once you enter the game as the MC, the surname is used incorrectly for the aunt, grandma, MC, and sister. Only the mom gets the right surname. If you look at below, the surname is set in 5 different places:
Perhaps set the surname once, for the mom (mom.surname), and then the aunt, grandma, MC, and sister, all reference mom.surname. That way it's only used once for the entire family, instead of setting the same value in 5 different places?