Not his father! :C
So, uhm.. yea. Littlefoot's mother wasn't even his actual mother. If you remember at the very beginning of the first movie, Littlefoot's egg gets STOLEN out of another "longneck"'s nest and then mistakenly makes it to Littlefoot's "mother"'s feet and hatches.
So, becially.. she adopted him.
SOOO.. that would mean that she was never pregnant with him, and that Bron was not his actual dad.
PLOT MISTAKE MUCH? Sorry.. that just really bugged me.