a mother of two admits she has a favourite child because of his smell .
amie cox says son alex has had ' a smell since he was born '
she says ` there 's some sort of smell connection ' with him .
she loves him and his brother equally but alex is the special one .
amie says she could n't choose one over another to live or die but favours alex .
the 33-year-old says she is being attacked and called ` a freak ' but she 's ` a normal loving mum '
sbs insight programme asks if sibling rivalry might lead to learning and mental health problems and whether family favouritism makes this worse .