Q. Hi. I will be spending Sukkot and simchat Torah with my daughter and son in law. My custom is not not eat in the sukkah on shmini atzeret, but my son in law does.
When I’m by his home should I eat in the sukkah? In the dining room?
On another note, should he be following my customs when I go to him (I am older than him and he should have the mitzvah of kibbud av) or should I follow his customs, or each their own?
Thanks and looking forward to a peaceful sukkot!

A. Horav Shlomo Miller’s Shlit’a opinion is that when visiting your son in law you should follow his tradition and eat in the suka on Shemini Atzeres, as any other guest would do. There are different opinions as to the extent of the obligation of a son in law to honor his father in law, which at best is only rabbinical. (Y.D. 240: 20)

Rabbi A. Bartfeld as Revised by Horav Shlomo Miller Shlit”a