I had that exact same kid in my care. He was also 3.5yrs old, aggressive, different parenting styles (his parents allowed him to rule the roost.). There was too much of a personality conflict between me and this child. I took very good care of his needs and was an excellent provider.... He was also smart as a whip and could be loving and "cute" but I did not like him. Never felt like that with any other child. ever.

As soon as I termed, the dynamics changed in my group as well.