[quote=Prince of Seraphs]
Hey dude, if he has Half-Blood cousins wouldn't that make him not muggle born.
[/quote]

His Dad's sister hung out with some hippies in the sixties. When she came home she was pregnant, and wouldn't tell her family who the father was. When she finally did, the stories about him were really fantastical, so we thought she must have been on LSD or something when she met him. His wife just assumed Phillip's a half-blood, though I suppose he could be a mudblood.

Wait, what year is it? It could be the early 70s when she was with them.
Also, theoretically, couldn't one of his parents be a Squib and it count as him being a mud-blood? The wiki says mud-bloods are the descendants of Squibs.