Last name didn't change after getting married.
I moved two sims in together and when they got married, the female still has the same last name she did before they got married, and their child has her last name.
Forum Discussion
Marriage last names changing is a known bug.
However when using the CAS Cheat, I'd recommend saving a game twice - one cheated, 1 non-cheated. CAS Cheats have also been known to cause issues as well, such as Load Errors. So use it with caution, taking steps to avoid any game loss.
However when using the CAS Cheat, I'd recommend saving a game twice - one cheated, 1 non-cheated. CAS Cheats have also been known to cause issues as well, such as Load Errors. So use it with caution, taking steps to avoid any game loss.
