My friends went through mediation...if that is a possibility, perhaps you can look into that option first. They both wanted what was best for the kids with the least amount of trauma / drama possible. And they also wanted to make sure the other one would be as ok as possible. It is a really difficult situation to go through but this seemed to create the least damage all the way around

Also, you may want to have a sit down with your family to let them know of the situation...but only if you feel they will be a good, solid support system for you. They love you and want what is best for all of you. But you are their daughter

(we are here, too, so dont hesitate to keep sharing and writing)