How to convince parents to keep piggies in room?

I have two 10 month old female guinea pigs. My mum says I have to keep them in the "dining room" but I want to make them feel like they're a part of the family. Nobody really goes in the dining room because we don't usually eat in there unless it's a special occasion. The only time the guinea pigs are around humans is when someone walks past, or when I take them to my room to play. They seem a lot brighter and happier in my room, so I asked my mum if I could perhaps keep them in there with me. I'm in there all the time except when I eat or if I'm at school, but as soon as I'm finished with those I'm right back up there again. My mum said "I don't care how clean it is, I don't want them up there." But that's what she said when I got my gerbils. They lived a long life since I convinced her to let me keep them in my room. But I don't think it'll work again with the guinea pigs. I know how to keep them from smelling, but keep them warm at the same time. But I don't know how to convince my parents to let me have them up here with me. Please help. Thanks. :)