itry04, your answer is incorrect. When two runners occupy the same base, the lead runner is entitled to the base as he is the one who has "legally acquired" the base. The followin runner cannot legally acquire a base that is already occupied. Therefore, the following runner is out upon bein tagged. Should he return to second base prior to being tagged, he is safe also.
7.03
(a) Two runners may not occupy a base, but if, while the ball is alive, two runners are
touching a base, the following runner shall be out when tagged and the preceding
runner is entitled to the base, unless Rule 7.03(b) applies.
(b) If a runner is forced to advance by reason of the batter becoming a runner and
two runners are touching a base to which the following runner is forced, the
following runner is entitled to the base and the preceding runner shall be out
when tagged or when a fielder possesses the ball and touches the base to which
such preceding runner is forced.