you need to pick your battles. Not every human food is bad for your pets, if your grandpa likes to give them treats like that then whatever it isn't going to change because you say so. They are the adults and have more say so in your home. Try to say that chicken bones could really hurt them, but if he wants to give them a scrap of chicken then so be it, if grandpa's happy, the dog is happy, and you are happy it is a win all around.
You can even get his help in training have the dog sit for a piece of chicken. See if you guys could make a healthy people food meal for them such as chicken, peas, and garlic to bond and train your dog.
You seem pretty ungreatful for your grandparents and i think you may want to rethink how you are treating them. You are atleast discribing to us that you tell them what to do, and to fork up the money for your pets. They are allowing you to keep your pets and they don't have to, they could load up the cat and dog and take it to the shelter if they wished, legally they have that right.
You could offer to do something like chores for money for the flea treatments, you could run errands, and so forth for them.
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