My knee has been bad since my bilateral release, someone wants to hire me as a nanny, would it hurt my knee to do all that walking or would it help it?

Likely painful: Severe arthritis will worsen with lifting (adding weight to the knees), climbing/descending stairs, and carrying tasks. Try some topical Voltaren gel, or offloading braces to,support your knees to see if that will,help or discuss this with your pain or Ortho doc and ask about Visco-elastic supplement injections, knee nerve injections to prolong knee life and decrease pain. THEN consider nannying.