- fathers who have sons
- mothers who have daughters
- girls who have brothers
- boys who have sisters
You do not have to be a complete biological determinist to think that, statistically speaking, this will lead to certain social or sociological differences
Even the most domineering paterfamilias might deign to educate a daughter if he has no son
More girls might be exposed to hobbies or casts of thought if their father involves them in pursuits which he might otherwise share mainly with his son
And so on
Of course couples might do their bit to confuse the statistics if those who have 2 children of the same sex are more likely to have a third child
