Just two days ago, her brother-in-law was jailed for prostitution-related offences.
Yesterday, Ngo Ngoc, 27, who had helped Seng Swee Meng, 42, operate a vice syndicate, was jailed for 18 months.
Seng was jailed for five years on Wednesday after pleading guilty to 15 charges, including two counts of abetting to obtain commercial sex with minors.
Ngo Ngoc, a housewife, had pleaded guilty in January to five of the 13 charges against her.
She had admitted to three counts of harbouring prostitutes, one count of receiving a sex worker at Changi Airport and one count of living in part on earnings of prostitution.
The remaining eight charges for similar offences were taken into consideration during sentencing. Ngo Ngoc, a Singapore permanent resident, sobbed silently as she sat in the dock.
The petite Vietnamese national is married to a Singaporean man working in the Education Ministry. The couple have a son, who is about three years old, and live in an HDB flat in Yishun.
One of Ngo Ngoc's sisters, Ngo Tien, 32, is married to Seng.
The trio, together with another of her siblings, an elder brother known only as "Ba", had worked together in the vice syndicate.
Ba's whereabouts are unknown, and Ngo Tien is on the run after she left Singapore for Vietnam last July.