Depends on what exactly it is you want to map. From a purely genetic perspective you're right, but being a parent is certainly more than just contributing sperm

Depends on what exactly it is you want to map. From a purely genetic perspective you're right, but being a parent is certainly more than just contributing sperm/eggs. And besides - it's very hard to know if someone is indeed the biological father of a child, without resorting to dna testing. Who's the mother tends to be a bit more accurate, although that's also something that could be faked.