My 3yo son is obsessed with Peppa Pig. He doesn't even sit properly unless he watches it at least for an hour. If I don't put it on, he starts crying. What should I do?

Any habit formed takes time to break! Start gradually. Reduce the TV time. Tell him that meals are meant to be eaten with the family on dining table. Be consistent. Your child might cry and throw tantrums for a few days but eventually will get used to the new habit. You need to have patience though!