iphone remote screen access

Hello - Being able to remotely control my Dad's Mac screen via Message invitation has been a life saver. His memory is fast fading and he can't do anything on his computer without me helping him.

He can't remember how to use his iPhone anymore either. He gets stuck and upset. I try to talk him through it, but it just doesn't work for him.

Does anyone know if there is an iPhone version of remote access on the cards with Apple? It would be so amazing for helping people with cognitive decline.

Thanks!