I applaud you for stepping up to the plate to obtain custody of your birth children. I would caution you that this will not be an easy road, especially if you are in a district that has a high case load or makes the dads go through hoops. You need a lawyer immediately to begin the process of getting custody. The first step is to get tested for paternity. It sounds like a no-brainer but you and the court need the written evidence (DNA test results) that you are the father in order to vigorously pursue custody. Your attorney will then begin the process of delving into the reason the birth mother gace her children up to her parents and will most likely use that against her and the parents. In most courts nowadays, the focus is to make sure the children's health and welfare come first. The age of the parents and their income and stability or lack thereof will come into play versus your desires to get custody of your children. Most courts prefer that if at all possible the biological parent should have custody (as long as there is no sign or history of abuse, crime or druig or alcohol abuse). Make sure your work life is in order and make sure your health plan will allow you to add your children as dependants. Essentially work with your lawyer to show the court you are ready, willing and able to love and care for your children now that you know they exist. Good luck to you and hopefully you will have them in your arms soon!