Is naming a newborn a joint right between the parents, or does the father have the right to delegate his father (the paternal grandfather) to name the child as a form of honoring him? And is it considered disobedience if the grandfather does not choose a name? And does the mother have the right to name her son if the husband does not choose one?

Naming the newborn is the father's right, and he may delegate this right to whomever he wishes. If the father delegates his father (the grandfather) to name the newborn, the mother has no right to dispute that. Pleasing the grandfather in this case is considered an act of filial piety. However, if the father agrees to delegate the naming to the mother, there is no harm. If the mother names the newborn and the father does not object, it is permissible. Naming should not be a cause for disagreement, and it is preferable for the husband to involve his wife in the naming process.