Do some men only make one gender?

[motherofboys]

I know what you mean. If all the things involved in swaying are true then there does seem to be some genetics but on the woman's side, I guess the right ph environment or levels of hormones that favour one gender could be passed through the girls. Following my maternal route back it was very girl heavy. But also they say that life style and diet makes a difference. So if each generation live in the same area and have a similar life style that would also make sense. With dh family it's been one man in each generation that has all boys. All his male cousins only have daughters.