You could very well be right about Greenbury's father not being named Benjamin. I actually had a pair of family trees compiled by different family members and one of them actually listed "James" instead of "Benjamin". But I went with Benjamin since that tree seemed the more reliable of the two. However, your Greenbury Murdock is a good match for mine. The wife's name (Henrietta Craig) is the same as the one my tree has, and you list Washington as one of his sons, and I know that to be a name of one my G-Grandfathers. There seem to be some other little differences that I'm curious to look over, but it's very possible that we have a connection.