My New Baby!

Hello, I'm new to the forum. I actually was just googling some coat colors and came across it, thought it might help! I recently bought this colt as a weanling and am absolutely stumped as to what color he is! I know his mother was a bay tobiano, but not sure about the father. He's a TWH. He has a few spashes under his belly where I believe he will be a paint of some sort. He has 3 white stockings and his tail is half grey/black half white. He is puzzling me! He has a sort of tan/red tinge to his hair as well as it being grey. He hangs out with my pig, they're best friends haha. Help!