VISITING A SICK PERSON ONE IS NOT ON GOOD TERMS WITH

If we go to visit a sick person one isn't on good terms with, has had a fight with, or is angry with, then InshaAllah we will get twice the reward (Thawab) for visiting them in their sickness. The first thawab would be for visiting a sick person, the second would be for suppressing and going against one'e own negative feelings in trying to bring comfort to a sick person.

Visiting a sick person to bring comfort to them is not a minor deed. It is a great virtue. We should not waste it by turning it into a ritual and a return transaction, for example having an intention that because someone came to visit me when I was sick, will go and see them in their sickness, but because someone else didn't visit me when I was sick, I will not visit them in their sickness now. The only intention we should have in our heart when going to visit a sick person is that it is a great act of worship, the Holy Prophet ﷺ has commanded us to do so, it is his Sunnah, and that Allah Ta'alah has promised great reward (thawab) for the person who performs this act of worship.

From the talk "The etiquette of Iyadat (visiting a sick person) by Mufti Muhammad Taqi Usmani Daamat Barakatahum