Is a person considered disobedient to his parents if he saves money for his children instead of giving it to his parents, knowing that the parents have enough money to suffice them?

Financial support for parents is not obligatory unless they are in need. Anything beyond that is an act of piety and benevolence. The questioner should seek reward for what he spends on his parents and siblings without boasting, and should strive to please his parents as long as he can combine that with providing sufficiently for himself and his family.