Sorry to hear that dude!
i know that has to hurt big time! And to have to put up with the witnoid crap on top of that. That has to suck!
Look here dude, you might not like what I write next, but think on it a bit. You want to make things a little easier for yourself, remeber that your dad is hurting big time. We live our lives thinking that We'll never live to see our sons in the grave, and then, SLAMMMMM, it happens! It is just not natural! So your dad is hurting big time young man. He is going to do the only thing he knows to do to cope. He'll try to convert you. Realize that he thinks that if you die outside of the organization's good graces, you'll be dead for eternity. So he is both trying to comfort himself and save you at the same time. Really, dude, we often dont' think beyond our own feelings at a time like that.
So the best way to handle dad is to be polite and respectful. Respectfully listen to him, but make no commitments. Keep you goatee, but make sure it is neatly trimmed and you are neatly dressed. Not even the JWs can legitimately gripe if you are and it is just good funeral etiquette anyway. You show your love for your departed brother on both counts (what you believe he'd want you to do, and respect for the occasion). I know the recruitment pitches will grate on your nerves, but my advice will save you alot of hurt and tension until this passes.
You have my prayers WLG. I hope you get through things alright!
Forscher