I run out of steam with it real quick, so they mostly avoid each other or actively hate each other. If I do have to have them interact, I have to write the scene out ahead of time and fast ping so I actually finish it.

That said I will handwave stuff, like Jaina sending Sia baby pictures of her grandfather to freak her out (which is why Sia avoids her), or Jaina's absolutely sent stuff to help Rey, because sometimes I can't not.