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> You can tell a son that all their male ancestors had a son

This seems off... by counterexample, my grandfather had no sons, but three daughters (one being my mother).

Your mother is not a male ancestor. Parent was just saying there is a line of all males for men and all females for women.

No, but the maternal grandfather is still a male ancestor. Parent said "all male ancestors had a son", which is not true. The true statement is that, for any generation of ancestors, at least one had a son.

I agree that's what he probably intended, but that's definitely not what he said.

Yes that is what I intended. The line up the father side for the boys and the mother side for the girls.

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