Is it permissible to make a donation to one parent without the other while both are still alive, for example: building a mosque for one of them?

The questioner : He says: May the Shaykh be respected, is it permissible to make a donation to one parent without the other while both are still alive, for example: building a mosque for one of them?

The Shaykh : The Prophet (peace and blessings be upon him) said when he was asked: . So there is no harm in preferring the mother with good companionship over the father. But if he knows that the father, if he sees him preferring his mother over him, will be affected by it, then he should not show his father that he preferred his mother with anything, in order to avert harm, because some fathers cannot bear that their child prefers their mother over them. And they consider that to be undutifulness to parents. If that is the case, avert the matter. And do not inform him that you preferred your mother over him with anything, and the concern will be removed, with Allah’s permission. Yes.