One of his youngest already has night terrors that they never properly addressed; it used to be many moons back he'd leave the stream to help them get to sleep, then it became "their problem"; same with his oldest daughter who's he's described as violent and distant, which is what makes her his "favorite kid". These are serious problems that Nick and Kayla didn't assist with and actively exacerbated and I can guarantee the extreme stress of living in a crackhouse and getting raided are going to have lifelong effects regardless of how much, if any, therapy they get.