In case you didn't find the other half sibings...There were 4 children born in England - 2 lads & 2 gals 1942 to 1948 and the girl married 1963. I will personal message details in case you don't have it
I'll personal message John, as perhaps he didn't get notified...when the site has an overload it can dump notifications. He also may have changed his email contact info though...
All the best J.J.
