Alive?

Thinking their son was dead, Lily and James Potter moved to Ireland with their twins. Now they are returning to the Wizarding world. What happens when they find out their son is alive? How will this change the life of one Harry James Potter. Pairings include Harry/Ginny Lily/James Remus/Tonks Ron/Hermione Sirius/? OC/? OC? Rated T for safety. Please R R