We know that in the sequel trilogy, we only see Ben Solo, but what if there ARE other children of Han/Leia, and we just didn’t meet them? If Ben is supposed to be like Jacen, maybe we didn’t see Jaina or Anakin. They could’ve been in hiding from Ben during this time, maybe doing Jedi training in the Unknown Regions. Maybe Leia, while reaching out to Ben, was reaching out to them too. This is probably unlikely, because we could say “why were they not talked about?” But a reason could’ve been that they were separated from each other or something.