Sponsorship visa

I am in a fix , pls help me decide
I want to apply for PR to australia , and my My brother in law is willing to sponsor for under the relative sponsor ship scheme
He got is PR in JAN 2009 currently living in Adelaide ( applied for PR , onshore in June 2008 after competing his 2 yrs study in Australia ) is also willing to sponsor me .But the problem is that he although applied for his PR in june 2008 , started working in a pvt company in accounts dept from june 2007 and declared to the company that he is already a PR , naturally he worked more than 20hrs a week .( did not disclosed any job experience while applying for PR)

He is scared that if he filled the doc of 1277 form where the question for the last 2 yrs job experience is concerned he will get into trouble and would have adverse effect on his PR