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"If Pauline's mother didn't have something she could knock my nana's door and vice versa," said Dawn.

Prosecutor Nana Owusuh said it is difficult for investigators to quantify the financial benefits of the "well organised" scam or to "calibrate any gains".

All through high school, college and my first job, and then on through my marriage and the birth of our two children, my nana kept plying me payouts, now $100 a pop, then more like $1,000.

"We were thinking, was it a bit of chicken he ate, or an ice cream his Nana gave him - she was feeling terrible about that - or was it something in the water?"

They fell ill after drinking six vodka shots served to them at the Nana Backpackers hostel in traveller hotspot Vang Vieng.