Dear Concerned: Your daughter-in-law is mentally ill and is abusing her son emotionally.Note that the mom is a lunatic, but it is still the dad's fault.
The fact that Dad permits this is reprehensible. Call Child Protective Services, and ask that someone check out the home situation. Talk to the principal and counselor at Jeremy's school.
I did not include the letter about the crazy mom. Yes, she is nuts, but I think that about 10% of moms are that nuts. The only thing that keeps them from causing a lot of destruction is a husband being the head of the household. The nutty single moms do cause a lot of damage.