I have 2.9yo twin boys and we live on the second floor of a tenement (so 100 year old, slightly worn out, spiralling stone steps - not the place to be messing about).
I need to get them to walk up, either just ahead of me by themselves, or holding my hand. They are perfectly capable, spend one day a week at my parents going up and down stairs for fun, and were getting pretty good here when it was more of a challenge. Now they insist on being carried. And I have no alternative, so stick 15kg of boy under each arm and stagger up 42 uneven steps with no hand left for me to hold on with. It scares me and that makes me angry with them.
If I leave one he'd probably start following us. I mostly try enthusiastic coercion, but just as one starts playing along the other has a strop and everything becomes negative again.
I have methods I should employ more often to make the whole thing safer (sling/harnessing one into the buggy while I get the other upstairs/try harder to sell flat and move), but really I just want them to walk up!!!