Just think if he marries Fiz he will have Cilla as a mother in law

Wouldn't that in some weird way make Leanne and Maria related?

Yes probably step-slappers

LOL! Well, if kirk married Fiz, then he'd have Les for a step-father-in-law, and so would have Leanne as his step-sister-in-law, making Leanne and Maria step-sister-in-laws through marriage. I think. My brain hurts!