Kate and William are married and have 3 children. Taylor, Elizabeth and James.

Brooklyn never marries, but gets a short relationship with Kate's sister.

Bonnie marries a man named Teddy Harris, they have 4 Children. Harry, Leyton, Ben and Rosie

Kate's sister Marries a man named Tyler Mane. They don't have any children

Kate's lover marries Kate's cousin. They have 2 children. Rose and 

I didn't realise the coincidence with Kate and William until now. Sorry