It is a new family. And interestingly, the game never seems to have trouble photographing my family members, just everyone else. If I try to take a pic of the sim's spouse, it recognizes her for what she's doing (eg A Sim Fishing), and as My Spouse, and something like My Main Squeeze, and sometimes even Housemate. But to get A Sim In The Area, or Two's Company, or any other pic of just a sim, it rarely works, on a family member or any other sim in the game. Almost every time I try to take a picture of another sim, whether a friend or stranger, there is no recognized subject, and it seems not to count towards skill challenges like the paparazzi challenge.