Went to a family birthday party in Liverpool today and discovered I had three cousins I never knew about. Their mother and her sister were brought up from being a young girl by my great-aunt (by marriage) & my great uncle (my grandma's brother). Their mum & her sister were always part of the family and my dad considered them his real cousins. What I never knew was that one of the girls had three children, who (while not blood relations) are effectively my second cousins. Had a fantastic time getting to know them. Another of my dad's cousins answered a knock on the door one day to find a daughter he never knew about stood on the doorstep. Anyone else come across any long-lost family?