Fellow Londoners: who's the first Londoner out of the Edmonton lot, on me mum's side of the family?

For the record, me grandad was born in The North Mid, down in Edmonton in Nineteen-sixteen, me mum was born down there in Nineteen-fifty, I was born there in Seventy-nine, and me sister was born there in Eighty-three. Now, I know that Edmonton used to be Middle, back in the day, but I also know that it later become part of London, further down the line, but when? And who's the first Londoner out of the Edmonton lot, on me mum's side of the family? Is it me grandad, me mum, me or me sister? I'd REALLY appreciate YOUR angles on this one, please, guys. Much obliged! Peace and love! Be lucky! :)