I can’t vouch for the quality of it, but apparently there is a body of evidence that families with sons are less likely to divorce.
Set aside the facile just-so evolutionary explanation.* What intrigues me is the implied corollary that couples with more kids are more likely to stay coupled, since the more kids, the more likelihood of having a son.
Could the Church’s encouragement to larger families and discouragement to divorce be synergistic? Perhaps even inspired?
*I think the argument for evolution is sound; the argument that most evolutionary explanations are the purest invention is even sounder. If the facts were reversed and daughters make divorce less likely, you could equally well argue that “evolution” explained the result because daughters without dads in the homes were more likely to enter puberty early and be easy sexually (this is true, btw) and therefore fathers needed to be around to get their daughters better quality mating opportunities. Which is plausible enough, except that experience apparently doesn’t back it up. The evolutionary argument proves little to nothing.
In fact, evolution aside, not wanting my daughters to be 13-year old tramps is one of my principal reasons to stay married, the other being, as anyone who knows the Lovely One can attest, that in the connubial cards I was dealt five aces and even this lackwit has enough sense to clutch them.