BTW - one of the easiest ways to expose for the people when they're standing in front of a bright background like that is to switch to spot meter mode - this allows you to level the 'crosshair' center point on the precise area you'd like to meter on, then half-press to lock the exposure when you have it the way you like. With spot meter, you'll see amazingly different metering depending on where you point it - move it over the background, and that will go perfectly exposed while your subjects go to complete shadow; move the crosshairs over the people, and they will expose nicely, but the background will go to extreme blown out white hot nothingness. If you want both handled better, you may move the spot meter around to the edge between your subjects and the background, and the metering will split between the bright and the shadow.
Also, you have a feature on your camera called 'DRO' (dynamic range optimization). If you set the DRO mode on, to the most advanced setting, and expose a little better for the background with a little dark on the people, the DRO mode will boost the shadows (the people) for a more proper exposure. It won't work miracles, but it can help a bit.