Two of the couple's three boys, aged between two and six, are under the care of their mother's aunt, Ms Wong Siew Kuen.
When contacted yesterday, Ms Wong, 50, said she knew about their father Quah Tee Keon surrendering to the police.
On Quah's allegations that Ms Loong had been unfaithful, she said: "That's what he claims."
When probed further, she said: "I don't know. Everyone has his or her own perspective."
She previously told The New Paper that the couple had been fighting over money for years. Their spats turned violent sometimes.
Ms Wong also said she had not been in contact with her niece, Ms Loong Mei Ling, who is staying with a younger brother.
Speaking over the phone from her home in Triang, Pahang, Ms Wong said the boys were fine and will return to Singapore once their paperwork is settled. The sound of children playing could be heard in the background.
The oldest and youngest children are with Ms Wong, while the middle child is with a cousin in Ipoh.
Ms Loong, who was stabbed in her right lung, was discharged from hospital last week.
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