And what of the fathers?
They also pass on DNA which might include a higher risk of certain conditions.
I have read that age and lifestyle of the father can affect sperm quality. Some studies have shown higher rates of certain conditions in children of older fathers.
In terms of lifestyle, if there is alcohol, drug use, DV, these all can increase risk to woman when she is pregnant and therefore child in utero, and also afterward after it's born.
Are the other children he has had and any known miscarriages noted?
If the mother and father had been recommended that the mother take thalidomide, then that's not just on the mother is it.
And I think that's a poor example anyway. Acting on medical advice that results in damage is not a sensitive thing, and it's unlikely to be witheld. The damage from thalidomide was quite clear afaik as well.