British citizen married to Chinese and want to visit China with Q2 visa

Hello, I am British while my wife is Chinese, so we are planning to visit her family in China with Q2 visa. As far as I know that we need to provide the basic documents as well as the invitation letter and the ID from her family in China. But do I also need to provide the marriage certificate at all?

If my wife is in China now ( she is holding a Chinese passport) and I want to visit her in China, can I also get Q2 visa? Do I also need the marriage certificate as well?