I've copied these posts from the "abuse from other parents" thread, as I fear Twitchy and I were getting close to derailing the serious issues raised in that thread. I had various cats before I had diabetes - some were family cats, but each tended to adopt a favourite human; then I had one personal cat who I had to rehome to a friend of a friend before going to work overseas, then had to come back when diagnosed. Current cat shares my partner and me (although it's just her and me when partner works overseas for several months each winter, when a furry hot water bottle is helpful!). She came with her sister who walked out of the garden one sunny day when she was only a few weeks old, and we never saw her again. That certainly affected present cat's behaviour - she was always the more affectionate of the two, but since her sister disappeared, she has remained very affectionate. I'm typing with her on my shoulders, which is pretty normal - fortunately, she's only little, but it doesn't improve my posture.
I did consider tying a wrapped sweet to her collar for hypos, but never carried out the plan, as one sweet wouldn't be enough, and she couldn't really carry 3 or 4, nor could I fix them firmly enough for them not to fall off, but not so firm that I could still get them off when hypoglycaemic.
I do tend to put her off my shoulders when standing in the kitchen for my insulin injection, as she's liable to jump off at just the wrong moment. But, if she's not on my shoulder, she's pretty liable to jump on at the worng moment, too!