Stayed in the family cottage with 3 kids. The kids had a great time. When we arrived, the fire was already lit and the reverse cycle air-con turned on (perfect for our July stay!)
Things to do - We toasted marshmallows in the fire and went for a bushwalk on the fire trail. The kids loved having a bath in the spa too! There is a DVD player, but movies are mostly for adults, so BYO if you need DVDs for kids. There is a ping-pong table downstairs and a park down the road (which we didn't visit, so I can't comment on that).
Food - plenty of food was provided (bacon, eggs, sausage, bread, cheese, juice, cereals, milk). But, there was no fresh fruit or veg, so you may want to bring your own. Tea and plunger coffee provided.
Recommendations of stuff to do with kids - Cafe 2773 in Glenbrook has a playground and animals. Very kid-friendly. Park behind the information centre at Glenbrook is awesome - good equipment and a little track for scooters. If you're prepared to drive a bit further, the lake at Wentworth Falls was great too - 2 big playgrounds, BBQ area and a massive scooter track, next to a lake with ducks.
Owners - lovely :) very welcoming and helpful.