Of the people you are connected to, who are their immediate families?
What is the name of your friends' wifes, boyfriends, children, parents? How do you spell those again? After a while you start to forget and mix up people's connections.
Other contact lists are for yours friends only, not their connection. With Facebook etc is up to your connections to add their relevant immediate connections and most don't.
This app is here to help you remember people's spouses', exes', etc names. You will never be embarrassed when meeting them again or writing birthday cards.
And only that. One purpose and do it well.