If your boyfriend has a half brother and a half sister that do not seem to be able to have children should you be concerned that you may not be able to conceive?

Answer 1

Infertility is not hereditary. Obviously if someone was infertile, there would be no offspring to pass on their defunct genes to! However a low-sperm count could be genetic.

There is also some medications that women have innocently taken in past that have caused their offspring to have difficulties - such has an anti-morning sickness drug from the 60's caused many girls to be born with an incomplete cervix.

There is no medical reason I can think of that would cause both male and female offspring to be infertile. It could be just a coincidence his siblings are having difficulties conceiving. And presumably your b'f is quite a different age from his siblings and from a different relationship, this means that their physical environment was different growing up. This would rule out an environmental problem (ie exposure to radiation).

I would not worry too much about it, but if you are trying to conceive and are having difficulties, it would be a valid point to ponder.