BBM,
There's a fine line between love and hate. One doesn't just kill 8 people, for giggles. They could have killed only DR, CR2, and HMR, and left the others alone, or, caught HMR out in the car, and just take her out. I think it's because the Rs had gotten something over on the Ws, and the Ws became afraid of them (the Rs, and HHG by default). Now what, exactly, that was, Idk. Otherwise, they could have gone through Family Court, and set up something, just like G4.
Yes, there is no paperwork trail shown that they first tried to settle custody arrangements legally. An attorney was mentioned but no one has said a thing about what he had done. It seems to have gone from a mutually agreeable arrangement to eight people dead rather quickly. I had a thought one time whether there was a demand that S would be guaranteed to be an heir to FW's money. The Ws would not want part of their fortune going to an R. I also thought that it could have been over support but it would be a stretch to make it over support unless JW didn't want to have to work full time to pay it. There had to be more going on to make killing eight people justified in their minds...