Kittens refuse to eat dry food, only wet; have diarrhea?

We have a litter of 6 kittens that are almost 2 months old. They prefer to only eat wet food, but it seems to give them diarrhea so we use it very sparingly. More recently we don't use it at all. They make an attempt to eat the regular cat kibble, which ends up being too much for them and they throw it back up. We've tried 2 different brands of kitten kibble, a generic brand and a high end brand and they turn their nose up at it. Even if we mix wet food in with the kitten kibble they still turn their nose up at it. They only want to eat purely wet food or human food. My fiancee and I have literally found ourselves in the middle of a feeding frenzy more than once because when we sit down with our meal they attack us because they're starving themselves out of their pickyness. We had to make the mother an outside cat the other week (we live in the country) because she kept fighting with our fixed male. At that point the kittens were already eating wet food, but the mother wouldn't turn them away when they attempted to nurse. We've got no idea what to do. We can't see any reason why these kittens won't eat kitten kibble and are being so selective with how they eat. Any ideas to help?