I am just curious, did your father resent coming from a large family?
I don't think these parents are focused on "will a child RESENT me". These parents are focused on what they feel Gods will is. And to raise EACH of their children to the best of their ability.
Parenting is leading.
Leading ain't sticking your finger in the wind to see which direction the wind is blowing, and following the wind.
And parenting isn't worrying about a childs resentment, when they do everything in their power to do things right.
With 18 or 19 brothers and sisters, they don't have much time for resentment. They learn REAL quick what life is REALLY about. And it ain't all about them.
The resentment you speak of, is of a child who EXPECTS things in life, and when not given to them, then they resent it.
I think there is close to a 100% chance of resentment from the child who is 1 of 3 or 4, whose mother is single, and spreads her legs for every guy that comes around, and sees her kids as little more than welfare payments.
These kids might have to SHARE their time more with mom and dad, but these kids KNOW mom and dad, and their siblings love them. Whats there to resent with that?