Congrats.
It is only my opinion, but I think that the primary focus needs to be building a solid relationship between you and your BD. The fewer people involved early in the reunion, the better chance that it has of succeeding.
For instance, if when I get to meet my bmom she wants to bring a bunch of family along, I will decline getting together. I want to ensure that we have the best chance possible of developing a solid relationship.
As for my family being involved in my first reunion, none of them will be there if and when we meet. My family is full of well meaning people that would never do or say anything wrong, but it could be a distraction.
I am sure that your kids will meet some day and it will be a great time, but at first it is all about the 2 of you.
Best wishes.