Rotti Troubles

[xixvnajlavxix]

I've had a new problem lately that is probably all human related. Kody is strictly my dog, so he's more trained then the rest of my family dogs, and he is very smart and knows lots of commands on top of the normal 5.
One of the basic ones I taught him was "Give." and he was very, very good at this because I wouldn't tolerate a growling dog having something they weren't supposed to after my last dog.
Well, I had a huge scare today. Lately when I'm at work, my parents are left alone with Kody, and they have been letting him eat tissues out of the box because its cute! I was horrified when I came home one day to a mouth full of Kleenex, but when I tell him to give me the tissues, he goes to obey and my mom just walks over me and tells him to "Finish Up" because its not fair I'm being mean to my dog she says >< Lately he just hasn't been doing the "Give" command at all, and I think its because its my mom over stepping me. Today I found him in my cat's toy box, a strict "no" zone for him, and then later he was under my mom's feet eating one of Bruce's fake mice! I told him "Give" to which he growled at me and swallowed it whole.
Although I know how to teach him to give, is there any way to help train my dog the "give" command again and maybe my mom? Please Please Please help, that Metal can't be good for him.