5 weeks ago, I incubated and hatched two ducklings and I have introduced them to my other two adult ducks (the parents, a Rouen Drake and a Crested hen.) yesterday morning. Since yesterday, they have kept a large distance from each other and the parents will hiss and charge at the ducklings when they get too close. At night I'm having to lock them up and they seem to each stay far away in their own corners. Are they ever going to get along and stay all together or are they going to stay isolated like that for the foreseeable future?