I had a similar adjustment with Juneau regarding stairs, I am also in a 2 level house, though at the time my stairs were carpeted which made them a little easier. I had a downstairs roommate who Juneau would regularly go to see, and even though eventually they moved out, Junebug still liked to make the rounds downstairs after they left. At some point I noticed that he was less stable and safe moving up and down the stairs so I decided to baby-gate off the stairwell and keep him up on the main level. If it's any consolance, it was over a year ago that I had to do that, so maybe as long as you keep Delia on a low-impact lifestyle she'll have lots more good time with your family 💖