The court was told that Tim Wongsiri, 50, had procured and forced two girls, who were under 15, and her own daughter who was under 13, into having sex with 45-year-old Briton, Stuart Hargreaves Lloyd.
Police said that Lloyd had raped the girls in Din Daeng, Hua Lamphong, Sukhumvit and Pattaya.
Both defendants have denied the charges, though Tim’s daughter and the other girls have provided verifiable details of the venues, times and payments.
Tim’s daughter told psychologists that her mother, who was previously a prostitute, had threatened to stop sending her to school if she and the other two girls refused to have sex with customers.
The court rejected Tim’s defence that her ex-husband had forced their daughter to wrongfully accuse her.
It has sentenced Tim to 41 years in jail for procuring girls for prostitution and gave Lloyd a 21-year jail term for raping minors.