I wish you well in your search, however your question does raise privacy issues if Philip is still living. I see you are a recent member and your mentor should be able to help guide you with researching your family tree.
Generally speaking the best way to start is with your own birth certificate, as that gives parent's details, then search for their marriage certificate and then birth certificates and so on back through the family history. If you're usnure of how to do this research just message your mentor and have a read at the help pages which you can access from the word help at the top right menu on any page in Wikitree.
Hope this helps