They explicitly say it in the article (in the second paragraph, visible even to non-subscribers) that there is no correlation in the first years of life of the son/daughter. Interesting hypothesis but seems false from what I read in the article.
> But, unlike previous work, their study also looked at the effect of the girl’s age. It found that “daughter-divorce” risk emerges only in a first-born girl’s teenage years (see chart). Before they reach the age of 12, daughters are no more linked to couples splitting up than sons are.
> But, unlike previous work, their study also looked at the effect of the girl’s age. It found that “daughter-divorce” risk emerges only in a first-born girl’s teenage years (see chart). Before they reach the age of 12, daughters are no more linked to couples splitting up than sons are.