This post has content warnings for: Family Death.

Victoria Rose | Bi trans girl | Game/UX Designer | Creator of Secret Little Haven | Your local otherkin cartoon snep kitty :3
Saying this having gone through this myself a month ago:
You are not obligated to go, but you should go if you cared about him, and if he cared about you as you are.
I went more for my mom's sake than my own, wore pants but didn't make a specific effort to boymode, didn't stick around afterward.
I do care about him, but my family asked me to not tell him that I transitioned, so he never learned it