Re: (for men)are you or would you be close to your in-laws?
What about Michelle Obama, she was known as Michelle Obama long before he ran for president. She was working as a lawyer. Most women who take on their husbands last name do it due to tradition, not for “political moves”.
Bilwal would be from Pakistan where the whole last name thing isn’t common like here in the West, we are talking about the States here.
Hilary added Clinton to her name when Bill was running for governor of Arkansas, she did that to help him win, as no one wanted a nazi feminist in the governors house.