Hello Redknight59,
I have looked at the births registered in the name of Hughes, mother's maiden name Masters. I can advise you that there were five probable siblings of Alfred W Hughes whose births were registered in Pancras District from 1917 to 1927.
Since it is unlikely these people are still living, the details are being posed below:
1917 Alan J.G Hughes
1920 Ronald E.L.Hughes
1922 Joyce M. Hughes
1925 Eric R.J.Hughes
1927 Sylvia D. Hughes.
It is likely that there are relatives of Alfred W Hughes, b 1915, who are living today.
I cannot find a child of Alfred W Hughes and Helen Harvey that can be identified for certain.
Helig