That is so incredibly sad. Your very kind for helping them investigate.
Dealing with brain cancer has some issues that need to be addressed. Mainly because of the confined space within the skull and especially brain stem cancers. Any of the therapies that can cause inflammation are dangerous and should be avoided.
Choosing a therapy that helps to revert a cancer cell into a normal cell should be priority. I don't know if you have ever heard of the "Photon Protocol" They or you could contact the Ed Skilling Institute for more information on the device and find out if there is anyone in their area that may have one available.
The frequency generators like the GB-4000 with M.O.P.A. is similar to the Royal Rife technology which reverts cancer cells. You could also look into the Cellect_Budwig Protocol as I know time is an issue. Through Cellectbudwig.com you can also get excellent phone advice and support from Mike Vrentas.
You might also want to try the MSM with Colloidal Silver or MSM/LIPH which works along the same lines reverting cancer cells. It should also help with inflammation.