Financial affairs before and after marriage for Millennials

Hi Terry, my daughter is 35, a marketing professional and financial independent. She doesn’t have student loans or any debts, own a nice home with nice equity when she sells it. She plans to moving in with her boyfriend who also owns a home (location and value not as good as hers) and they plan to get married next year. She wants to sell her house to move into his house because they want to buy another house together with more land when they get married. I’m from old school and do not approve living together as boyfriend and girlfriend but I know that I can not stop her. She is a responsible adult and financial independent, live in this modern society. My question is “what is the ethics and etiquette of financial affairs before and after marriage ” for the Millennials in U.S. ? What advise would you give to your own child? Thank you very much in advance for your help and stay well.

Agnes Chew