I've kind of been keeping an eye on this, Not obsessively, just when it shows up on my news feed.
I think it's a shame to see any family go through this kind of acrimony, I personally think Dweezil Zappa is a pretty talented guitarist and his efforts to keep his fathers music alive is a noble effort.
I used to enjoy Frank Zappa's music and actually I still do with One Size Fits Allbeing one of my all time favorite albums.
Most of this comes from gossip sites so I'm sure there's a lot of information missing, I wish the whole family a lot of luck and hope they can resolve their issues.
DWEEZIL VS. AHMET AND DIVA
Here's Inca Roads from the Zappa plays Zappa tour.