Sitting on a very busy underground train. 2 ladies and 2 children get on. One child, under 2, in push chair and 'mum' holding second child, 6 ish. Mum then walks in between seats with 6 yr old and asks if someone can please give up seat for her child. Mother nor child seem distressed or unable to stand. Lady in her 60s ish gets up for child, at next stop passenger adjacent to child and lady in her 60s gets off the train so mum and child seat together. No issues whatsoever. In fact are now chatting away happily ??? Comments please.