There are no rights and wrongs when taking family pictures, as long as everyone is comfortable on and on the same page. Nevertheless, some people wish to avoid making goofy faces, making the peace sign, sticking their tongues out, putting their hands in their pockets, looking away from the camera, making uncomfortable poses or expressions, or using a large zoom lens. It's generally best to avoid using too much Photoshop since you want your family pictures to be as natural as possible.