My fathers family were 3 boys.

All 3 boys all had a girl then a boy. (3rd in my fam was a girl).

My brother, sister, cousin & I all had girls first.
My brother & I then had another girl (sister & cousins 1st baby & brother has step dd & bil to raise, so no more there).

Ex did physical work when our 3 girls were conceived & less physical when ds was conceived.

But my dads job never changed to make a difference & my sisters birthday is the same month as my brother. So time of year the same.
My brother also does the same physical work like dad & ex. Though ex is still doing that work now & has a boy.

Don't know, lol. There are lots of coincidences in my family