The ruling on visiting a relative who does not benefit from the visit and does not know the visitor

Honorable Shaykh! If I have an uncle who has lost his mind, is it obligatory to visit him if he does not benefit from the visit and does not know who I am?
Yes.
If you have an uncle who is not of sound mind, visit him in order to check on his well-being. It is not a condition that he knows you, but visit him to ensure his safety and so that his relatives know that you are maintaining your family ties.