I have two DSes, three years apart. From DS2's birth until quite recently, I found I had much more patience for DS2 than DS1. Obviously I love both of them, but DS1 wore me out a lot faster, and given a choice between doing something with one or the other, I would always choose DS2.
But suddenly, now, DS2's tantrums are annoying me greatly, and I find DS1 so much easier. Thankfully, DH has lots of patience for DS2, so spends a lot of the weekend with him.
Is this a normal thing to have happen? Do other parents find they have preferences like this? How often do they change?
I do my best to be fair, obviously. I think I can cope with this sort of preference, as long as it doesn't turn into a longterm thing, I guess ...