Mae was my Mother who is now deceased, Richard and Karen were her children, I am trying to trace some of my family history, Karen would be married by now, so this would be most likely her maiden name

I see quite a few people have looked at this, I have some more information
Richard would be about 38 years old, and had a girlfriend in Wincobank, Karen would be about 42 years old, I am looking for family medical history, and they are my half brother and sister, I spoke to Richard briefly in 1999, but he never contacted me again, and I never found Karen, I think they would still be in the Sheffield area, they had lived in Heeley in the 70's and 80's, before my Mother died,
Richard was managing a nightclub in Sheffield in 1999, he has an x wife and I know he has a yound daughter.
Any information would be appreciated.

Have made contact with my brother Richard Jones, still looking for Karen