trying to find my family tree

i was born in calcutta india on 21 september 1946 my fathers name was charles keep he was in the army when he met my mother mable vera graham. he had 2 daughters my self and my sister june born 1936. we came back to england around 1948 i belive my father was from reading berkshire he had a brother.my mother was in a hospital so my father brought me and my sister up till he died 27 november 1951 age 61.when i went in a childrens home at the age of 9 he lost contact with family he died in coventry 27 november 1951 i would like to know my roots and if there is any living family yours sincerly lorraine ward