SINGAPORE - The Office of Public Guardian (OPG) had last week lodged a report against former China tour guide Yang Yin after it was reported that he boasted about his wealth and lavish lifestyle in a blog.

This was revealed on Friday at a media briefing by the OPG, which is looking into the case involving wealthy 87-year-old widow Madam Chung Khin Chun. Last week's report was made to the Commercial Affairs Department, who on the same day arrested Mr Yang.

The 40-year-old man is involved in a legal tussle over control of Madam's Chung assets, believed to be worth $40 million. He moved into her Gerald Crescent bungalow in 2009. Three years later, Madam Chung applied to the OPG to give him a Lasting Power of Attorney (LPA).

On Tuesday, it was revealed that Madam Chung has applied to the OPG to revoke the LPA. OPG said on Friday it was reviewing the application, but did not say when a decision will be made.