I've had these pop up before. One of my Sim's friends, David, called my Sim and asked him if he should get to know Allison better. Allison is David's wife and they have a 100/100 relationship. Yeah, David, you should--she's your wife and the mother of your children!
I like the additional phone calls from the Neighborhood Stories update, but the phone calls often leave me scratching my head in confusion.
At one point, my Sim's elderly grandmother called and asked her grandson if she and grandpa should try for a baby together.