You're right, it's the responsibility of the parents to nurture their children. That's why it's important to be prepared before being a parent because it comes with a lot of responsibilities. And I'm gonna hold to one point here
don't expect your children to care for you just because you cared for your parents
A blunt truth, but a child raised with love will care for their parents during old age, without being forced.
You're very right. Love is contagious