Cheermom1, I say this as someone who has watched several friends and loved ones go through this situation. . .
These situations almost never end well. There's a reason why you have not maintained contact with their bio father and his family. In normal circumstances you would want your children to have contact with extended family members. This is not normal. IMHO, you should dial back any discussions of meeting or contacting your children's bio family and bio father. Your children are at a very vulnerable age, in their middle teens. Establishing one's identity and growing into an adult are hard enough. Getting entangled with bio family that until recently has had nothing to do with them is only going to exacerbate feelings of abandonment and confusion. Provide your kids with information and support if they ask, but don't pursue anything with these blood relations who didn't think it important to pop up until now.
I'm not they have our info and if they want to have anything to do with them they know how to contact them. the ball is in their court.
thanks to everyone for all the replies it means a lot to me no matter what side you are on..I just need to do what I think is best for my kids and that is to let things work it's way to what whatever may happen with them. meaning that they know how to get a hold of the kids and it is up to them to show the kids how much they really want to get to know them or not.
I will continue to encourage my kids to follow the right path no matter if the other is easier in the long run it is harder. thanks all
