Hi. Sorry for what you and your brother are going through.
Some people do have a complicated relationship with hospitals.
It sounds like your brother does have a cancerous growth, and that growth is in more than one place. It would be good for them to do a proper metastatic workup and a biopsy.
There's other structures in the head besides the brain. There are the coverings/skins of the brain (3), there's blood vessels, there's the bone, and outside; the skin and some fat.