genes dont work that way though, just because someone has a large nose it doesnt mean their kids are also going to have one, and just because someone has a small nose it doesnt mean their kids is going to have small one either.
what about the genes of the other parent, or of both people's overall gene pool? genetics is a dice roll.
a large (as in slightly bigger than usual) nose is a very, very common trait that kids can inherit from literally any of the mom's and dad's ancestors, and sure as hell there is going to be a couple of people with a big nose in both families.
not to mention the genetic "defects" and variants that can arise regardless.
looking at your partner for how your kids are going to come out is going to give you a grossly general idea at most.