Foster Care Support Group
Foster care is a system by which a certified, stand-in parent(s) cares for minor children or young peoples who have been removed from their birth parents or other custodial adults by state authority. Responsibility for the young person is assumed by the relevant governmental authority and a placement with another family found.
I only mention this because maybe that's what the other foster parents are doing. I don't agree with them using withholding the visitations as punishment, that's just not right. I do however understand that the visitations have different affects on different children. I applaud you for doing what's best for your foster child, I hope things get better for all of you in the future.