We are going to start TTC next year after our son is about 1 1/2 years old. My question is what are our chances of having another boy? My sister in law has 2 boys from two different men and she insists my fiance can't produce girls. Which I want another boy. I am afraid of having a girl because I wouldn't know what to do with her, I wouldn't know how to teach her to do her hair, nails, makeup or anything because my mom never taught me any of it, so I want another boy.
So is it possible that a man can only produce one gender?