question about funerals?

Funerals are for the living.
Some older people have few friends left to attend.
It's a family decision. There's no right answer.
Without being in your family and knowing all the facts, my advice would be to defer to those that were closest to him.
Their grief and stamina weighs heaviest.
Don't let it bother you if you felt left out.
He was an uncle, not a father.