Parents do everything for their kids and this makes them a person with the strongest will. They do everything and even give up their dreams for the sake of their kids.

This is monumentally UNTRUE.
Not parents. Society and selfish men require WOMEN to abandon their careers in order to birth and raise children. Fathers are employed and tend to their careers, so the only people who suffer from unattended dreams are women.
So, until we have fathers in the same amount sacrificing their work, careers, and social status in order to raise children, you can not say parents.