How do you know your loved one is getting close to the end with PD?

Rescue33, what are you seeing with your loved one? Dad is 10 years into his diagnosis, wheel-chair bound, lots of trouble chewing & swallowing, drooling, dementia that seems to come & go daily, needs help with everything except feeding himself (tho very messy). But otherwise, he's pretty healthy, so it could get much worse.