John Mulaney joked his career would be over if he "did a perfectly accurate impression" of his mother-in-law

Asked about getting to know his wife's family, he told 'Late Night with Seth Myers': "It's the greatest single time in my life.

"I've been in a lot of interesting situations. I've never - marrying into a large Vietnamese family is one of the most fun things I've ever done."

When his friend asked for more details, the former 'Saturday Night Live' star quipped: "If I did a perfectly accurate impersonation of my mother-in-law, it would be a career ender. So, we all, kind of, know that."

Kimberley - who he affectionately calls Miss Kim - had joined John for his appearance on the late night talk show, and he joked that one member of the family always joins you "anywhere".

He teased: "One of them will come with you anywhere. And they call me John Mulaney, full name. A little wrong, full name all the time. 'Olivia is here with John Mulaney.' Yeah. And they're the greatest."

After moving to the US, Kim settled in Oklahoma, where she met Olivia's father Winston, and John eventually did an impression of the family's accent to illustrate the two cultures coming together.

He said: "So, [the children] have Vietnamese and Oklahoma accents. So, like, I'll do it. But... that's because it's really - it needs to be done and also max, there's like, seven people in the world who could be offended by this accent."

He also opened up on the differences with his own family, who he described as being "uptight" about lots of things, including "money, health, anything", as he admitted "almost everything his taboo".

However, he revealed: "The Luong family, they talk about anything immediately upon meeting you. Like, 'how much money you have?' 'Why you so skinny?' "