I don't have information regarding his parents. I wanted to mention his marriage record, though, but you probably already have it. A scan of the Washington, DC marriage record book in Family Search shows only the date (14 Nov 1843) and the names (John Phipps, Sarah Cursey) but no parents' names.
I assume you also already have his 1850 census listing in Washington, DC. Unfortunately, he was too old to be still living with his parents. I found it interesting that he was a gunsmith.