might have made a mistake

[Jack_Three_Beans]

But I'm sure it's better that they don't know until something definitive happens.

Yes. Once things seemed deffinite, we seperately started talking to them slowly breaking them to the idea.

I feel bad that they don't know what's in play between me and W

They don't need to know that right now. Spare them as long as you can. And once they know, if they ever do, do not try to enlist them to your side. They are non-participants. Do not make them choose, do not open up to them, be their father, do not let them become your support. Talk only well of their mother. Should it come to that.