Your father‘s condition sounds exactly like mine. I did the surgeries eight weeks apart. The neck first. Since they went in through my throat and thus did not cut through any muscle recovery was relatively easy. I am glad I did the neck surgery. It is what doctors wanted to do 35 years ago and I managed to avoid. However, the situation had deteriorated so much that a fall or a blow to the head of any sort could have caused me to be a quadriplegic. Eight weeks later, I did the lumbar surgery. It was mainly to clean out the stenosis. Recovery from the lumbar surgery was very difficult because they went through muscle. I think it has set me back. In retrospect, I might not have done the lumbar surgery. I certainly would not have done them at the same time. I think the main setback for me was the doctors did not want me doing exercise for a couple of months after surgery. So I became even weaker. Thank God for my Pilates/PT Friend who via Zoom had me work with small balls on my feet and on my hands. I would say I’m still in recovery. My balance is terrible And I am trying to get stronger. I am throwing the kitchen sink at it. I wish your father all success. Prayer helps.