Play therapy will certainly help the youngsters in you, maybe an internal meeting with the angry one and littles (or a littles rep if they are too scared to confront angry one) where things can be thrashed out as to why angry doesn't want it and why the littles do, maybe giving angry the option to opt out whilst the littles play. perhapse you could ask the therapist what kind of toys the littles would be playing with, then get a few for home and gently introduce them so angry sees them as less of a threat.
not sure if that helps but it is what i would do if i had such conflict going on.