to define my niche as a coach

I’m a life coach (but I have not studied at the life coach school) and will start my own business.
I’ve been thinking about how to be specific in my niche.

For example, I’m a mother of a child with a disability. My husband and I have accepted this fact easily and live happily with it.
But in the hospital, in the rehabilitation, and the therapies, I saw many parents who suffer and have big problems because of it.

My idea: I would like to coach “mothers with children with disabilities or serious illness.”
What do you think of this idea?
Is it accurate enough, or should it be only “disability”?

Thanks a lot!!!