Good news! Just a word of teeny caution,and no need for alarm, but have your daughter keep an eye on him, though I know she will, Depakote can be very sedating and cause weight gain, I hated it,my nephew as a teen was also put on it,and gained weight,got depressed and whole bunch of things one would think the opposite (depression area),my nephew started with suicidal ideations he had not had before Depakote,sure the med keeps you from mania,keeps you from anything, has potential for zombie world.
When I was in hospital for the same or sort of same thing your grandson went through, they kept me and monitored the Depakote, and Remeron(another med pdoc allowed me to stop immediately) so it needs to be watched,cause dosages get changed sometimes even after discharge date and follow ups.
I feel having this all done for a first time, being done at the hospital rather than home,was the best choice, just for the closer medical and psychological observation.
For me it was safer than starting at home, cause I drove a lot,far, to college every day,part time while being a mom when myy son would be home from school. I did have 2 incidents while still on Depakote, and lower dosage,where I fell asleep at the wheel, almost drove into the rocks that line the PA TPK., woke up just in time, and the 2nd incident was on a local road, the cars beeping around me woke me up. Soooooooooooo, I switched to Lithobid, and then switched to Lamictal a couple years later.

Okay, I'm not knocking Depakote, there are people that respond well, but it also is used more today,when first admitted or self-admitted to the hospital cause it takes less time for knock down, and the pdocs have more free time, I do not mean that like "free fun time", but time to go to the next patient hosp and office. They devote a little less time with having to titrate the med as closely as other excellent meds, like one of the first, greatest, Lithium. I mean this as no disrespect, but actually a few pdocs have told me that is why when admitted, they usually start Depakote vs the other tried and true meds.
Whatever, I do wish your family lots of luck with this.
Sincerely,
Rosanne

(((((((((( sabau2 and family ))))))))))))