Yes, I never really knew either set of grandparents, never met my dad's father because by then my grandmother was with someone else. Met one aunt and uncle for the first time at my 18th birthday party and ever met my dad's oldest sister at all, although my sister knew her.

All mu=y aunts and uncles are gone now, with the possible exception of my dad's half brother and his ex-wife, but if the're still alive I don't know where they are.