Has Serena and Eric's father EVER been mentioned? Is he still alive?

he's actually NEVER been mentioned, not even when serena & eric talk about lily's many boyfriends.

no they never actually mention him. lol

There is an interesting foreshadowing of sorts in the episode "valley girls" where a teenaged Lily is with her sister at a party of a guy named 'van der woodsen', who im guessing would later be her husband and then their father