Welcome to our forum.
It sounds like you have gained the most important part of any poly relationship -- consent from all involved partners. As time goes on (and the NRE mellows out), you will probably encounter other challenges, such as communication and whatnot.
There seems to be a lot of love going around right now, which is encouraging. I think the kids have to be told sooner or later, as they can be pretty smart at observing things on their own.
Glad to have you with us, you've obviously traveled quite a surprising journey to get here.
Love means never having to say, "Put down that meat cleaver!"