Doesn’t pru u’rvu require having two boys and two girls (with some shittos saying one of each)?
I’m not aware of that. It’s a machlokes in the Mishna between Bais Shammai and Beis Hillel.
B”S says you need two boys. B”H says you need a boy and a girl. IIRC, the children themselves need to be able to have children as well.
Of course, this is one of those mitzvos where sometimes you can just try and try and still not make it. My grandfather had five daughters and no sons.
The Wolf