Before update with first child: id left_id right_id tree_id name symlink_id 1 1 2 1 Test 1 NULL 2 1 2 2 Test 2 NULL After update with first child: id left_id right_id tree_id name symlink_id 1 3 4 1 Test 1 NULL 2 1 2 2 Test 2 NULL 3 1 3 1 Test Child 1 NULL What I assumed should happen is )if I understand it correctly): id left_id right_id tree_id name symlink_id 1 1 2 1 Test 1 NULL 2 1 2 2 Test 2 NULL 3 3 4 1 Test Child 1 NULL