I am currently tracing my Family tree and upon receiving my Grandfathers Service records (WW2) i found out he was married before and had kids

Elizabeth Chisnall and James Roberts married 31/12/1938 on the marriage certificate the witness was Willian G chisnall (Elizabeth Brother) and someone else names Bridget Mcginn however i have no idea who she is.
Also James (grandfather) lived 36 station road at the time of the wedding and Elizabeth was living at 26 parr Avenue Haydock.James father was Named Isaac he was a coal miner and also my grandfather at the time was also a coal miner.
My grandfather had a daughter named Sheila and on his service record another named Alfred however I cannot find his birth certificate so this could have been his middle name maybe if he was named after my grandfather (james)
I dont know anything about my grandfather before the war or his other family but i really want to find out more and hope his daughter or son are still alive as my father has half brother and sister he has never known.
Any information anyone can provide would be brilliant
Thanks
D roberts




