Need to find a staircase ASAP.

tldr; I need a staircase with wide steps that you can comfortably stand on and reposition yourself. Preferably even take a full step before climbing the next step.

My father in law was diagnosed with ALS, and there's a medication that can help him. Unfortunately, his insurance company wants to make sure the medication will "actually help him," and is refusing to pay for it until he can prove he's still able to get around by climbing a staircase without using the handrail. We're trying to find the most senior-friendly and accessible stairs we can.