Spent some time researching if this route was suitable for children on trip advisor and guides at Scenic World. This is a steep staircase. But don't tell that to my 4 1/2 year old. This is a must do when visiting the Blue Mountains. I would recommend 1 adult to supervise each child and only if children are used to stairs and bush walking. We started at the information centre at Echo Point. Stair case is through a rock archway to the left. About 10 minutes walk to the first descent which takes you through another rock archway down the stairs and on to the bridge actually on to the first of the 3 Sisters. Then continue down. A half way mark is engraved into the rock floor with a small lookout and seat. About 3/4 of the way down a pair of Lyre Birds overtook us as they ran up the stairway. Took about 1 hour to get down, having plenty of rest stops and time for hands to warm up ( the handrail gets very cold for children). Then continued through easy rainforest walk to the Scenic Railway. Pay for the train ride up as you get off the train. All up it was 2 and a half hours from Echo Point to the railway, saw heaps of Lyre Birds and pass directly under the cable car on Katoomba Creek. An amazing walk. Well worth it.