The "warm and bittersweet" series "about living your life avoiding conflict, avoiding making decisions and avoiding the mess that causes" focuses on Ranganathan and Knappett's characters as they split and juggle parenting their son.
Series 1 saw Ranganathan's Jonathan moving into his sister Danielle's home, much to the annoyance of her partner Courtney.
Creators Romesh Ranganathan and Benjamin Green say: "We are absolutely delighted to bring back the dysfunctional Nadar family and get our incredible cast back together. We feel we should warn fans of the show that unfortunately Romesh will be wearing a lot of Lycra in Series 2. Sorry."
The commission was announced by BBC comedy commissioner Jon Petrie at the BBC Comedy Festival in Cardiff, where the BBC called comedy "a public service and needed now more than ever". A total of 10 commissions were announced. Full list of new shows