A woman has discovered that her sister is pretending to be her baby's mum on Facebook. *Sara had been touched when her sister *Narelle offered to babysit her seven-month-old daughter once a week after she headed back to work. The new mum had only been able to get 12 weeks maternity leave – so her sister’s assistance was a massive help. Sign up to our Kidspot newsletter for more stories like thisSara discovered that her sister was pretending to be her baby's mum. “Your sister needs help, serious help.