Is it considered an act of disobedience (ʿuqūq) to ask parents for fairness in dealing with and giving to grandchildren, and what is the appropriate response to this annoying behavior without violating Islamic law?

Justice must be observed among grandchildren in giving gifts, just as it is among children. Other relatives are to be measured by the same standard due to kinship, and the required equalization should be proportionate to their inheritance. As for treatment, grandparents should be gentle with their grandchildren and avoid showing favoritism to one over another, as this can lead to resentment and envy. It is advisable to convey these meanings to grandparents gently without explicit declaration, while encouraging children to show more devotion and care towards their parents and to be patient with what comes from them, rewarding them for it.