The key to mobility is rehab and exercise if it is possible. Encouraging rehab and being there as a cheerleader works wonders. I have years of experience I can share if it will help.
I have been a caregiver for my life partner, who has Multiple Sclerosis, for over 35 years. She uses a wheelchair full-time and is almost completely dependent on me and our paid caregiver.
I shattered my kneecap and I was in a straight leg brace for 8 weeks and then had to learn to walk again.
I'd be happy to share my experience if it will help any of you.