Recently asked me question related to booking of unreserved ticket (for minors/children). I realised I can't find a way to book ticket for a child (together with, let's say, her parents) on irctc site where parent don't want to take reservation for the child. For instance, if child is just 6 yr old and parent decide, she can share berth with her mother, they still have to buy reservation for child if trying to book online. Is my observation true? Or are we supposed to buy such tickets from station itself??