dukeandduchess:

Duke and Duchess of Cambridge arrive for jubilee

Anonymous
If Harry has children before Kate and Will, the son of Harry will be in succession before the children of Kate and Will?

No.

No matter how soon Harry has children, his children will not be before William’s children because, William is in front of him in line to the throne, and he is the heir.

Unless William dies before having children or abdicates Harry’s children will never be in front of William’s in line of succession.