urgent!! How do i move one game object from one local position to another objects local position??,How do i move a gameobject from one local position to another local positon?

What i am trying to do is i have 2 parent objects having 5 children objects each! so i have a bomb gameobject which i want to move from parent 1 to parent 2's child's local position.. I am trying to make that bomb object child of parent 2 & then trying to move it to that particular child's local position. but its going somewhere else. when i use the world position it works fine but i dont want that because when i move that parent object the bomb dosent goes to the new updated position... Can anyone help me with this plz>>???? its urgent ,