Things to consider
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There came a time when we had the same issues with my mom. And its funny - my boss is taking his dad to Hawaii tomorrow and just got his dad on board with a wheel chair last year. Something funny happens though- they do get more comfortable using a chair out of town(maybe it's easier not seeing everyone they know.) Helpful if you have a "grandkid" that might hop on their lap for a lift too.
Don't remember if you mentioned flying or not-but airports are big too- there are options to have help with an airport wheelchair too.
Other options- we ended up asking my mom's dr for a wheelchair prescription.
Depending on insurance, medicare etc, we did not have to pay anything. It takes about a month to get all of this done- so if you think you might want this option-just convince your dad to ask and you may end up using the wheelchair for other situations requiring long walks. The other option is you will just see your parent opting to stay home. The wheelchair was helpful in the airport. We used it in the airport and gate checked it- just like you would a stroller. (there are other options in the airport though too). When we gate checked, we removed the foot rests and carried them on the plane in a backpack. The first time we didn't do this and one had come off in the belly of the plane-they went back and found it but we just learned to take them off ourselves. If you gate check- they bring it back up right away as soon as you land if you have layovers and then you just gate check for next flight. We would walk up the plane to the front row of seats-and mom and I would sit back on that front row- the stewardess would give us the "hi" sign when she saw the wheelchair had been brought up and we were on our way. Very efficient.
Unexpected- my mom's neck was sore the first time we used the wheelchair in the park- she had never spent all day looking up before.
Also- IMPORTANT- learned the hard way- if you are taking pictures- have your dad stand up and leave the wheelchair to the side. My mom was noticebly sort of dismayed when seeing herself in every picture with the rest of us standing up around her. This got better where she didn't care anymore- but at first when they are getting used to the idea- keep in mind.
And for some reason- everyone assumes they can't hear and talk when they are sitting in the wheelchair- they would ask me- "can she walk? or can she stand?" I wanted to say- "why don't you ask her?" It made me think of things I'd never considered before. Important at the airport if you use a wheelchair- just have him stand up and get out and push the wheelchair through the security thing. (All of this is just if you know he is sensitive.)
Also if you dad swims- consider just having a noodle-or something that keeps him from having to use all of his strength/effort. It can be a subtle thing you take care of and he might use if you don't really make a big deal of it. Don't even act like its for him.
On rides where you have the moving walkway where you board and have to do it quickly- I'd just grab his arm if you notice he is a bit unsteady. And here too- I would just volunteer the info- that he is using the wheelchair for long distances - not because he can't walk at all. That way he can stay in the wheelchair during the line. There are some Disability entrances or methods for every ride and some sort of mainstream you through the regular line and some is different. Somewhere there is a Disability instructions for Disney officially from the park.
Sometimes my husband just folded the wheelchair- we could just pull up on the seat and it scrunched up and he just sort of held it near the back of the bus and my mom climbed on herself when she was able. Most of the busses either lowered or that first step was really low- not like older ones where you had a big step. That way they don't have to sit while the lift raises them up sitting in their wheelchair. All of this depends on if they are sensitive and if they don't really need that aspect of the wheelchair.
Good luck- pretty soon he'll think its the only way to go. And remember if he is content to go back to the room and rest- he might not even care about going from Dawn to Midnight. My mom was really encouraged that she could still go on vacation.
We never did the
ECV thing- my mom wasn't a great driver.