Thanks again everyone. Starr now seems to be back to his old self and I haven't noticed any diarrhea or mushy poos since Sat. He hasn't had any more accidents since Sat. morning so I think it's safe to say that the food is now out of his system.

I have to feed Starr back in my bedroom so he won't get into the others food and I can't let him back out until the others have finished. I also have to make sure that no crumbs are left behind. Starr loves to eat and he sniffs around as soon as he gets out to see if he can find more food. I wish that he could understand that eating his siblings food will make him sick again.