Bill's first wife was Alison who died from breast cancer in 1980. She was the mother of Kevin & his sister. This information comes from Wiki but it is strange that Kevin's second wife was also an Alison & I wonder if Wiki have the wrong name for Bill's first wife.
I remember Kevins sister now. Whatever happened to her. That's something I disike about Corrie - people hardly ever mention sibings/daughters/sons/parents who move away (apart from the endless Jim/Liz merry-go-round which is just SO tedious).