Mum-in-laws and cooking for their sons... would you try to make a dish your hubby likes better than she does? Or would you simply ask her for her recipe to share?

It's probably not a idea to compete with the MIL since your husband (if fair) will never take either side. If you try to compete, it will put you and your husband in a spot. The best way around this situation is to ask her for her recipe. It's another matter all together, whether you make it or not.