Find Ancestors

I am trying to find siblings or relatives of my grandfather HENRY JAMES STAITE who I believe may have been born in the south of England between 1870 and 1910 on 2nd February. His mother was a Miliner by trade. He had 3 sisters named Ada, Alice and Elsie. Alice was thought to have been a 'bit of a wild one' and was educated at Roedean Girls School in Brighton. She later moved to America. As a young boy my grandfather lived for a time in Portsmouth but eventually moved to Canada and joined the Canadian Horse Artillery when war broke out. After a few years he moved back to England and married my Grandmother Lilian Atkins. They had 3 children although during the early lives of the children they divorced. It is thought my grandfather died when he was around 88 years old (maybe around 1970-1980) at The Marie Curie Hospital in Caterham, Surrey. I would be grateful for any information.