Gluten Free

My Mother and Partner have to eat gluten free but are hopeless at actually sticking to it. I've tried to cook them things because it's starting to take a toll on their health especially my SO but the next meal they have is nothing but crap! I'm thinking about cooking and freezing meals every week but I can't help but feel it isn't my job? I have 3 kids and my Dr said it's not healthy for them to be eating like that all the time so I'm doing 2 different meals and im exhausted by the end of the day. Am I an arse or should they start looking after themselves better?