Diana's killing people because she didn't have someone guiding her. King Frederick, her forster parents' deaths have given her a warped idea about death. She has very little or no morals at all her killing people is because she didn't have a stable upbringing since Kelly's death. Kelly may develop powers but Adalind will want him to exhibit the better traits from both parents, particularly Nick's since she doesn't have a good opinion of hexenbiests or zauberbiests at the moment. Adalind's not happy about Diana killing people, she'll want her to stop and find proper ways of dealing with those around her especially when she doesn't get what she wants. Kelly has better chance of not being murderous like his sister. If he becomes a Grimm, he will kill but I hope it won't be as indiscriminately and flippantly as Diana who doesn't seem to have a moral compass.
If Diana were to end up living with Nick, I don't see how that would be good for anyone. Diana hasn't really shown any desire to be controlled. She's humoring Adalind because she's her mother and probably has a weird understanding of the kind of dynamics between parent and child, that she must do as her mother tells her but I doubt she'd give up on the power she has and wielding it freely. With Nick, she'd be forced to tone down a lot while with Sean, he'll let her let loose except when it comes to murder. There'd be more freedom with her father than with Nick. For Diana to have a chance to grow into some version of a decent human being, I'd say Adalind needs to be a single parent. I don't trust Sean and Nick has his own responsibilities that will clash with Adalind’s. What this means for Kelly, I don't know. I don't see Nick as a single father, parenting 24/7 and Adalind won't want to be away from him and that brings us back to where the show ended, Adalind with both children with the slight difference ofAdalind being independent, Nick having access to his son and the same for Renard with Diana.
If Diana were to end up living with Nick, I don't see how that would be good for anyone. Diana hasn't really shown any desire to be controlled. She's humoring Adalind because she's her mother and probably has a weird understanding of the kind of dynamics between parent and child, that she must do as her mother tells her but I doubt she'd give up on the power she has and wielding it freely. With Nick, she'd be forced to tone down a lot while with Sean, he'll let her let loose except when it comes to murder. There'd be more freedom with her father than with Nick. For Diana to have a chance to grow into some version of a decent human being, I'd say Adalind needs to be a single parent. I don't trust Sean and Nick has his own responsibilities that will clash with Adalind’s. What this means for Kelly, I don't know. I don't see Nick as a single father, parenting 24/7 and Adalind won't want to be away from him and that brings us back to where the show ended, Adalind with both children with the slight difference ofAdalind being independent, Nick having access to his son and the same for Renard with Diana.