Grieving for the holidays


My dad died almost 6 months ago. With Thanksgiving and Christmas coming up my mom came up to me and asked "Should we even put up a tree or celebrate?" I told her it would be up to her. (My mom, me and my fiancé all live together) I just want some opinions because I think we should because sooner or later we going to have to. I don't think we should not celebrate because he's not with us anymore. What do y'all think?