I didn't find anything online.
However William couldn't have been a Revolutionary War Vet if he was born in 1774.
New Jersey wasn't recording births that early in time.
I did find their marriage info online but no parents were listed. I'd look in the local newspaper for their marriage announcement. Both sets of parents might be there.
I'd check the Sussex County Historical Society's website, www.sussexhistory.org/annals/genealogy-research-nancy-pascal
to see if they have any additional information. Successful Searching!