Should i go?

Go.

Yes, being with family, however well you already know each other is good.

Making this gesture does you good.

BTW, you refused to visit her because, unlike everyone else, you're awkward at that?

I HOPE you realize that that was a huge mistake, and that you not repeat that mistake.

Go.

Stop shirking your humanity and membership in your own family.

me me me me me and more me! Forget about yourself! Think about your dad! will that be possible? Will you actually be able to put your dad first in this instance? maybe not? the world revolves around you? huh? Here is my point! Screw how YOU feel and start thinking about WHAT THE #$%& YOUR DAD MAY BE GOING THROUGH! you said he had already gone to visit your aunt 4 times before she died so, my guess, they were close. So do you suppose your dad might appreciate you being with him during his time of need? Do you suppose your dad may be hurting right now and might need his family around him? Do you suppose you can support him at this time and go along with spreading his sister's ashes because it might be IMPORTANT to him! Naw , Screw him! this might be too much of an imposition for you. Remember that when your sitting at his table eating his food, living in his house or asking him for money or wanting a FAVOR FROM HIM THAT MIGHT IMPOSITION HIM OR NOT IMPORTANT TO HIM! Damn!

None of this is about you. It was never about you.

Visiting a dying relative is about your dying relative. It lets them know that you care about them. You did not do that.

Funeral type activities are not for you either, or the dead person. They are to comfort the closest family. (Your father.) Your father needs his family around him as he does these things.

i would go, maybe your dad needs your support

I think that if you don't go you'll end up regretting it later on. A few years ago I was in a situation like you and ended up not going. Now I really regret that decision and wish I had gone. Just go with your feelings but you may end up regretting it if you don't go.

Out of respect for your aunt and your dad you should go if you can. It's the selfless thing to do.

Go with dad to offer him support do not have a tattoo as it is a permanent thing, ask dad if he has a photo you could copy to remind you of aunt

There's a very wise saying that "funerals are for the living, not for the dead." I can't tell you what to do, but you might want to take that into consideration.

Don't go if you don't want to.
But consider that your Dad might value your companionship on this trip due to his loss.