You don't have to know your father - a 'y' dna match would give you your bloodline through your father, his father, his father, his father, his father, and so on...
Well, that'd be exactly what I'd want then... Due to circumstances in my conception my mother has no interest in allowing me to know such information, yet I'm entirely heart set on getting my family tree in a somewat complete state...
It'd seem however that the item I'd need would be the expensive plan, as I don't know much abbout my mothers family as well... So the family tree thus far only goes back to the late 1800s and i'd like to see it a bit more full.