If they aren't being moved due to sale or literally moving, there's no reason to move them. While travel is fun for humans, for most animals it is only stressdul. They don't see it as a fin trip to see family, they just know suddenly they're in a box again, the floor is moving, there's new...
Where are you going that requires them to come with you? At 4 weeks, they're old enough if you can get someone to check in they'll be fine staying hone