I seem to remember a study some years ago that found that a surprising number of husbands who are not the biological fathers of their wives’ children are completely unaware of that fact.
That’s why we have Jerry Springer.
Same here. If I remember right it was done in England and it was designed to look at what genetic predispositions each parent gave to the child. In the course of the study they found (if I remember correctly) that 20% of the children were not biologically related to the “father” and he had no clue.