I’m so sorry you’re going through this (and that your grandson is going through this). It sounds like his medication is not effective or maybe even making his mood worse. It could be time to try a medication and/or dosage change. If his current physician isn’t willing, then get a second opinion or start working with another professional.
I don’t know a lot about bipolar, but I imagine there is the possibility of in-home therapy to try first, before considering placement in a facility.
Here’s more on bipolar:
I hope you find treatment that provides some relief to your family soon!
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism