"To me, I want to spend more time with my children."
Madam Foo agreed, saying: "I told my husband that maids can never substitute us as parents.
"Peter is very open-minded and he didn't mind. He really looks after the kids very well. And I respect him for his sacrifices."
The first few years were tough as the couple struggled a little to make ends meet. They had to plan for everything that they were going to spend on. It also meant shorter holidays to places like Hong Kong and Macau and eating out less.
Madam Foo said: "It helped that we were staying with my mother while waiting for our new flat in Punggol."
But six years on and the couple are still very happy with the arrangement. Their twins are now six years old and attending pre-school.
Madam Foo has since joined a fund investment firm as a business manager and earns more than $5,000 a month.
She pays for her children's school fees and household expenses such as utility bills and groceries. When Aston and Chelsea were born, they spent three and five weeks respectively in the intensive care unit in the hospital.
"They were so tiny and it was not easy to care for them," Mr Chua recalled.
The couple had to hire a maid to do the household chores so that Mr Chua could fully concentrate on looking after the twins.
With the role reversal, Mr Chua was the one who woke up in the middle of the night to feed the twins and changed their diapers.
Now that the twins are in pre-school, Mr Chua begins his day by waking up at 6.30am to get them ready. He drops them off before taking his wife to the MRT station where she takes the train to work.
Before picking up his kids at 11am, Mr Chua goes grocery shopping or dabbles in stock trading activities.
After fetching the twins home, he ensures that Aston and Chelsea have a good bath and lunch before supervising them in their homework.
"After they have finished their homework, I play with them or read to them," Mr Chua said.