Yeoman was separated from his mother and siblings in a great divide within his former pack. He doesn't remember them anymore and dreams less and less about family and life before as he is slowly forgetting it all.
Rydel often tells him he has great potential but takes nothing seriously despite the circumstances. He's basically just comic relief which is quite comforting for the other characters in the group. He knows nothing of his father as he passed before Yeoman was born.