"does the money legally go to the girl or her parents/guardians" - what a funny way of looking at things. An employer with a 16 year old employee would just pay

"does the money legally go to the girl or her parents/guardians" - what a funny way of looking at things. An employer with a 16 year old employee would just pay that employee and wouldn't recognise the parents as having any right to it. At 16 you pay PAYE - i.e. income tax.