I have an identical twin brother whom his wife and he have had four children, all of which are females.  I have only had one child and it is a male child and my wife and I are planning on having another child.  We are wondering if it will be a boy.  Is there any research or data that shows that in identical twins, one twin will have all children of one gender and the other twin will have all children of another gender?

Thank You!

Michael Price

I've not heard of, nor can I find any information that that is the case.

agreed the sex is determined when a sperm fuses to a single ovum - in other words a random chance event every time.