I'm English, my other half is French and we're trying to raise a bilingual family in London. Our son is 4 years old and typically answers in English no matter what language we speak to him in.
A while back, I asked for French story recommendations on here and got some brilliant suggestions, thank you! I've used these, and others, to create a stage-by-stage guide of great French books by age with prompts to bring the story to life, in the hope that great stories capture my son's imagination and get him talking in French. We've had early success with a few books that have really caught his imagination and he's happily chatted about them afterwards in French, so I tentatively feel like this could be effective in addition to the standard things like OPOL.
Does this seem like it would be beneficial for anyone else? I'd be happy to share it with any other families to see if it can make a difference for them.