I just had the same issue. Installed Genesis as parent theme, then installed Oasis. When I tried to activate Oasis theme it said theme is broken and needs to install Colibri parent theme (I did not sign up for Colibri theme, I just want Genesis/Oasis).
I’m not even sure if a child theme can have 2 parent themes (Genesis and Colibri). I’ve installed Genesis themes dozens of time and never encountered this issue.
