Find Ancestors

could anyone out there help me out, i appear to have hit a brick wall, i am trying to to trace my mums (phyllis) family who are as follows, my grandfather fredrick clarke born in london approx 1907 died approx late 1940s, he was married to my grandmother elsie may (maiden name unknown) they had eight children as follows, phyllis (my mum) rosette, barbara, betty, dorothy, brian, dennis, charles, i believe they were raised in sembly dorset and gillingham in dorset, charles was last known to be working on a farm in wales, please i am sure someone out there might know one of them, i have been searching about 15 years, and i need help, i also know that my grandmother remarried when my grandad died, she married a gentleman called john lawrence, apparently he was a matron at tree herbert hospital in s/wales untill approx 1964 when he was transfered, all emails will be answered.i have just found out my grandfather died not early 1940 but in 1950 in gillingham where he was also buried