Advise: "In our family we do this"

Yea I know princess… it makes complete sense (the traditional way) … I have no idea how this opposite thing caught on in my family. And yes - I will talk to my mom and I’m sure that she will be understanding ..but i think she will be sad too since its been a custom for a very long time in my family.

But besides this particular issue - i am talking generally …how do people compromise when there are different customs and traditions in both families??? Like which families traditions/customs does one go with ???