I didnt say my mare is his mother, she is not.
Cowgirl, sorry but I am not going to risk it. Its sort of irresponsible to just keep them together and hope they don't breed. They certainly can breed at any age but its a low probablity. The more times you expose a colt to a mare, the more your probability goes up. You can't generalize and say horses can't breed till 4, that may get you into a little bit of trouble in.
I don't really have the choice to wait too long. A friend is letting me keep him at her house, with a pony for the time being. I am not going to push my luck keeping him there and just wait it out. Besides the fact the longer I wait the more chance I have of him staying studly.