Actually that was my DH Winny 
See, I think it's really interesting that you think OPOL is so important, because no one I know who is bilingual grew up with that (not just my DH but a number of friends, and now seeing the children of friends). We're not doing it either and so far DS seems equally comfortable with English and French.
This is why I am more relaxed about things like dinner, I think, I have seen firsthand that there are many paths to bilingualism, it will depend so much on the child, the parents, the environment. I think all you can do is what feels right.
Also, you have to recognise that while bilingualism is great for kids and something we want for them, not all children will want to be bilingual. And I don't think it should be forced on them. Looking at my DH family, they are French and lived in lots of places growing up, they range from his brother who refuses to speak anything but French, to my DH who speaks five languages.
I think the best thing is to expose your DC to your language as much as possible when he's this age and just see how things progress. 20 minutes of dinner converstion in English is not going to be the difference between him being bilingual or not.