Child development expert Siggie Cohen, who has worked with over 5,000 families, shares one communication mistake she sees parents make every day. Here's why she says it can backfire, when to set clear boundaries and how to use questions more effectively.

Australia news live: Attorney general warns women and children at risk of ‘harmful conduct’ from smartglasses users; major delays at Sydney airport
<p>Follow today’s news live</p><p>Federal parliament is returning from winter break next week.</p><p>Do you have a question you’d like to ask Guardian Australia’s team of political reporters in Canberra? Our political editor, <strong>Tom McIlroy</strong>, and the team will be answering readers’ ques