The husband at the grandmother had the twins, what probability, what at us will be two at a birth?...

[Dyne]

The husband at the grandmother had the twins, what probability, what at us will be two at a birth?
And more such question: whether some genetic predisposition to conception only girls is possible or probable? At ours with the husband of sisters one girls.

[Nekrasova N.J.]

Probability of twins low. About 5 %. Only girls are not present any genetic predisposition to conception.