My wife of 14 years has bipolar disorder.
My experience with it as someone caring for someone with it is that, when properly managed with appropriate medications, it’s nothing we can’t handle.
Once we found meds that worked effectively, as long as she’s taking them things are fine. She understands the importance of being properly medicated, I make sure she always has the medication she needs and she takes it.
In our normal day to day I don’t think either of us think too much about it. I do know though that there are things that can trigger a manic or depressive episode. Sleep changes are a massive trigger for her, so we stick to a pretty solid routine. She can tell when it feels like she might be on the edge of a manic episode. We check in frequently when that happens, I provide support, and we get her doctors on the phone if we need to.
But in all our time together we’ve not had to go back to in patient treatment once we got our arms around it.
Good luck to you and your son. Just keep in mind that manic episodes are big and loud and people can feel a lot of shame about things they did while manic after the fact. Care, love, support and understanding are the best context to help your loved one find a path that will work for them.
A happy, full, and healthy life for your son is still more than possible.