Miriam is Kenny Hotz's sister and has appeared in many episodes. She has one son whose age in unverified.
During the episode "Who is the Strongest" Spenny is challenged to beat her in a weight lifting competition. To compensate for the fact that Spenny is almost certainly stronger than her, Kenny began claiming that she has been working out for 3 months, and leaving indications around the house that she has been using steroids.