Need advice and help!

My mother is handicapped and really relies on the wall and railing to get up the steps.

How do I replace this? What advice or should I do? Reinforce this area where there is no studs?

Thank you for any input and ideas!

My mother is handicapped and really relies on the wall and railing to get up the steps.

How do I replace this? What advice or should I do? Reinforce this area where there is no studs?

Thank you for any input and ideas!