I've been accused of being a Scrooge in the past, Res. You're ex is a sea hag in tight pants. The buying of presents business is completely out of control. Children know love and they can tell the difference between presents under the tree and who really cares for them. You have every right to see them, no matter what. Tell her to take the gifts she bought "on your behalf", return them, and buy herself a muzzle.