How to understand this sentence "Marry a daughter-in-law and forget her mother"?

I think it's because my son got married and has his own family, so he has more responsibilities and changed his concept. He should consider not only his mother's thoughts, but also his lover's. After all, he is a family, and sometimes he loses his temper with his family because of something, so he will be considered as "marrying his daughter-in-law and forgetting his mother." I didn't listen to my mother. I remember being teased by my neighbors when I was a child. When I grow up, don't marry my wife and forget your mother. Only when I get married can I fully understand this sentence. In fact, I haven't forgotten my mother, but I have considered the problem more comprehensively.

Some people think that maternal love is more obvious to a son than anyone else. She paid less attention to her mother when she married her daughter-in-law. Mother often misses her son, so she has to work as a daughter-in-law, so that she can care more about her mother and become a mother in the future. If she does, her mother will change her opinion of you and treat her daughter-in-law as her daughter.

Others understand that men don't kiss their mothers when they get married, because marriage means getting married, leaving family of origin and having their own lives. They need to work every day. For their small families, they take less care of their mothers. If their life is difficult to maintain and they need to ask their parents for help, they will be considered as marrying their daughter-in-law and forgetting their mother.

"Married a daughter-in-law and forgot her mother" generally refers to the newlyweds who are still in love and only care about the new daughter-in-law and ignore the people around them, especially their parents. Parents will feel lost, or they can say that their mother can't accept it and will be jealous.