Thank you all so much for the replies, they are all appreciated.
Yes Suz that is the family. I am trying to find a birth and death cert for the Thomas, brother of John but have never ever found anything apart from his marriage certificate. I have posted before looking for Thomas Kavanagh but thought it might help to try to follow John because, as you say, Thomas is listed as being born in Wrexham and Spennymoor but wasn't, I have come to a dead end there too. However, John never varies in his birth place of Ferry Hill so if I can get to know his mother's maiden name from his baptismal records I might have more chance of finding Thomas. Why there is no death cert to be found is a mystery but after more than ten years I am grabbing at any thing I can to try to find him. Many thanks for all the help.