To see how blatant “scientists” could be…all the example are of afro-americans families…I guess n1 implication is social…many women have their first born at young age., and a lot of sons too…sometimes the father disappears…or , in many event…the oldest sons have to work soon to give support.
There is a wide gap of age between sons many times in large families, and it happens last sons have less to care to mantain the family.Oh no…off course it is just genetic…I’d be interested to find out genetic differences in the sons of millionaire families playing sports…I guess none could be found…