Hey guys I think we should all work on correcting the incorrect grammar in Talk That Talk.
It can actually go two ways this time. You can use Uncle Jack as a full name ("...Uncle Jack off his horse.") or you can clarify your uncle's name as Jack ("uncle, Jack, off his horse."). It depends on what you call your uncle, really, but in no case should you say, "Uncle Jack, off his horse."
Oh, and this trips people up a lot. "I am taller than her." is incorrect. That is a shortened form of "I am taller than her is", which is obviously incorrect. Therefore, it should be "I am taller than she.".
You's the easiest one though. It's the same all around.