Purpose built Avoriaz is a true ski-in/ski-out, pedestrianised resort, where you get around on horse-drawn sleighs rather than cars or buses. At 1,800 metres, it's also one of the most snow-sure ski resorts in France.
Only an hour and a half from Geneva Airport, private or shared minibus transfers are readily available to take you up to Avoriaz. If you are driving, then you can drive up to Avoriaz but you need to leave your car in one of the car parks (indoor or outdoor) at the entrance of the resort. From here you can be taken to your accommodation by 'piste-basher' shuttle or horse drawn sleigh. A great way to start your family holiday!
In addition to the short transfer time and ski-in/ski-out accommodation, Avoriaz makes for a great family holiday thanks to it's dedicated ski areas for children, top-notch children's ski schools, and a wide choice of other winter activities (including a wonderful swimming complex with slides). It's a compact and fairly flat resort, so walking between your accommodation and ski school or the ski lifts is not too arduous - important when you are carrying more than one set of skis! Have a look at a Map of Avioriaz. You can bring babies to Avoriaz too. The slow drive up to resort should not be a problem for them although some paediatricians advise caution because of the altitude.
Avoriaz is a great option for a summer holiday as well, particularly if you are a biking family. The Alps are very beautiful in summer with hot sunny days and cool nights, and plenty of activities and events to keep you occupied.