We parents love our children with equal commitment, but it may not look the same.
Every parent of siblings has been assailed by the “It’s not fair!” claim at least once. This complaint from an angry child may follow watching a sibling get more attention, more freedom, less punishment, or a pony. This accusation represents an attempt to cause parents guilt based on the pretext that life should be fair and each child should receive exactly the same responses from parents.
Maybe in a parallel universe, but not in this world.