What approach should I take?

Long story short- Stripped of all my parental rights when boys were taken from my care when they were 7 & 10. Eldest son turns 18 on Saturday. Do I just go right up to the house and knock and ask to see my son? Or wait in the car for him to hopefully notice me & come out? Will it break my younger son's heart not to be able to come? What do I do?