His sister is Rebecca Harkin. She is also a performer. His parents are Siobbhan (SIC?) and Kevin. He also reportedly has a grandmother that lives nearby in Derry.
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1 sister
Siobhan = English = Susan (Mother) Kevin (father) Rosa (god-daughter) Peg/Margaret (Keith's Grandmother) Rebecca (Keith's sister)
The Partridge Family
There has never been a character on Family Guy named Keith Griffin.You are thinking of another TV show.
belinda c. harkins
No they just look a lot alike