The Australian Cattle Dog is a herder, they prefer that groups of animals, including people, stay together and move along at a pace they dictate. With adults and older children who can be involved in training this can be overcome, but younger families and those with toddlers will find this difficult. This breed requires a lot of time to exercise and train which may conflict with family time commitments.
While many dogs are traditionally thought of as being good with children, all dogs and children need to be taught to get on with and respect each other, and be safe together. Even so, dogs and young children should never be left alone together and adults should supervise all interactions between them.