All children have a 50/50 chance of being male or being female. There is no true predisposition of having all male or all female children because it depends on the strength of the sperm and which sperm reaches the egg first. If the stronger sperm is an X chromosome sperm cell the child will be female while if the Y chromosome sperm cell is stronger then the child will be male. With women it does not matter because women have 2 X chromosomes versus men who only have 1 X and 1 Y. So the probability that the second child to b born a male will be 50/50 just like any child that is born.