Foster fathers and grandfathers are being barred from living with children for whom they are the primary carers after undergoing tough new child protection checks.

The Administrative Tribunal has been flooded with appeals against bans issued by the Office of the Children's Guardian under strict laws introduced last year.

Tough new rules are barring grandfathers and foster fathers from living with children they care for. Credit:Jessica Shapiro

Six out of 10 cases decided by the tribunal in the past six weeks were found in favour of men who had been forced out of the family home or prevented from working after failing a check.

In at least two cases carnal knowledge convictions recorded against men 40 years earlier when they were teenagers and in a relationship with an under-age girlfriend caused them to fail the Working With Children Check.