My 89 year old dad will not listen to my advice. Any help?

Oh yes... Fluid intake is a common problem. Thirst reflex diminishes & ornery attitudes increase it seems 😣

You can lead a horse to water as they say.. 🐴🐴🐴

I put a small glass of something on the table & let the horse decide.

I have seen a nurse mark a glass with a marker pen - you have to drink down to this line by lunchtime. But the really stubborn/spirited will *accidentally* knock it over.

I think it's time for assisted living for your sake. It's very frustrating to be doing your very best for your dad and doing everything you can to keep him healthy and safe and have him dismiss your advice. At assisted living, as others have pointed out, they aren't going to give him advice or 'make' him do anything but they will keep a watchful eye on him and, if you need to have medication management services, provide his meds and watch him take them each day. They'll do weight checks and blood pressure checks, etc and will keep an eye on him without making it personal. He will have much more feeling of independence when no one is giving him daily advice and oversight and you will be released from the feeling of responsibility to make certain every little thing is done correctly. Then, when you actually do make a suggestion he may be more willing to consider it. My dad hated the feeling that we were trying to run his life and he would get very stubborn, even in the face of common sense. He didn't have dementia, just a stubborn, independent streak. He felt that every decision that was taken away from him was another step on the road to losing his independence, so he fought every idea for improving his situation. If you can find a nearby Assisted Living I think you would both be better off. When my dad moved to Assisted Living it certainly changed our relationship for the better.

Not to mention, the staff in AL are not going to 'make' your dad drink water/juice during the day or take advice either! They're only there to help him with whatever HE says he needs help with. If he refuses to drink fluids & gets dehydrated with symptoms, the staff will advise the nurse who will take his vital signs & call 911 if it's deemed necessary.

Don't confuse Assisted Living with a Skilled Nursing Facility. AL is for fairly independent seniors who require minimal help with Activities of Daily Living *ADLs*. In reality, nobody can force a senior to do things they don't want to do. If your dad goes to AL, you can sign him up for the medication program (for a fee) where the staff will dole out his medications to him on a schedule, however, so they'll stand there and make sure he does take the meds.

Good luck!

Only you can decide when you've had enough and feel the best option is assisted living, or some other type of facility.
Most people make that hard decsion when their loved one is no longer safe in their environment, and is a danger to themselves. I'm not sure that the fact that he doesn't want to listen to your advise is reason enough, but again, only you know how much more you can take.
I can only guess that the fact that he is your father, that he really doesn't feel like he has to listen to you his daughter. And who can blame him? He was used to you having to listen to him for all these years, and now that the table is turned, it's probably very difficult for him.
You have to do not only what is best for your father, but also what is best for you. Best wishes.