My mother never complained - one of the last things she said before she died was "I expect I shall pick up soon - must start the spring cleaning next week!"
Mother-in-law was a different sort altogether - she enjoyed ill-health and had almost every disease known to man, plus another couple which she'd invented. She always said that the doctor found her case 'unusually interesting', whereas I knew that he dreaded the sight of her. I met her when she was a patient at the hospital where I was a nurse - I couldn't help noticing that she was visited by a handsome son, whom I married shortly afterwards, but I knew from day one that she was a difficult and demanding woman.
She kept her family on their toes until the day she died, in her late eighties, and though they resented her, they always did what she wanted.
It seems to be a fairly common problem, and I'm sure that all of us who have experienced this sort of behaviour will go out of our way to never be a thorn in our children's sides, so as Jingle says, Falconbird - just don't worry - you won't turn out that way!