These are thoughts & facts about some in laws I know.
Narcissists don't do favors for someone out of the goodness of their heart. They must see how they would benefit from the favor. They feel that they are owed something in return & expect an enormous amount of gratitude for their good deed. They may do something for you that they know will make you happy, but there are always strings attached. You will never be allowed to forget this deed & will be reminded of it for as long as they live.