my babys sleep with us until they ask to go into their own bed, sometimes a mattress on the floor sometimes in their own room, i think they were about 3, although we still have a mattress under our bed if they are scared and want to sleep in our room. oscar still sleeps with us. we don't see it as anything wrong with it, in fact, it is quite normal in our community. perhaps change GP's, one who has done some research and knows that kids that sleep with their parents are much happier and healthier emotionally. it works for the majority of communities and it's only really western society that frowns on it. if you're happy keep it up.
beckles