Thanks girl guide,
Yes the two census entries you've posted are for the family that I have been researching. The birth for CTM you have listed is the one I got the cert for and shows mother Eva Reynolds and father Walter Martin, Walter did die in 1906.
The siblings of CTM, I have found their marriages and descendants. I have 121 cM shared with Winifred Martin's grandson and 37 cM shared with Marjorie Martin's grandson. Older brother Alan had one daughter and she is still living! I wrote to her about the family, she was able to give some Info but her parents separated when she was only five and she lost all contact with the Martin's from that point. Younger brother Frederick, I only recently discovered that he married his cousin, Enid Olive Ray in Willesden 1928. Enid died in 1931. I have not managed to find out what happened to Frederick after this.
Enid had a brother Kenneth Charles Ray born 1902, I have not managed to trace what happened to him after the 1911 census, their father Charles Samuel Millington Ray died in 1905. Don't know what happened to their mother Amelia Ray nee Martin.
I believe the amount of DNA I share with Marjorie and Winifred's descendants would indicate they were likely to be my 3rd cousins? So my grandfather is likely to be a 1st cousin of Alan, Winifred, Marjorie, Charles & Frederick? Can someone let me know if my thinking is right.