Understanding is still an issue with his parents-in-laws, Coyle says - though these days it's a matter of language.
"My Mandarin is better than theirs," he jokes, beaming broadly. "Because Taizhou is such a small place, they never speak Mandarin, and their dialect doesn't sound anything like the Chinese I know.
"So when I get back to Suzhou, it's like I'm coming back to China," says the teacher.
The couple bought an apartment in Suzhou, and in 2007 Wei Wei gave birth to a baby boy, Noah.
Now Noah's loving dad takes him to kindergarten in the morning and picks him up in the afternoon.
"His English now is better than his mom's and his Chinese is better than his dad's," says Coyle.
While his son goes to kindergarten, Coyle goes to university to teach.
A veteran teacher, Coyle says he still has a passion for teaching English, comparing it to a yummy Italian dessert.
"Do you like tiramisu? The recipe is the same but every different restaurant you go to has different tastes," says Coyle.
"It's the same thing with teaching. I can teach the same lesson but because students are different, everything can be different," he says.
Although some students call Coyle a "strict teacher," he's not convinced.
Teenager saves mom with his bare hands