In the current edition of the Little League’s Official Rules, Regulations, and Policies is a description and approved ruling for the instance when the offensive team is penalized for interference.
Visit Rule 7.09(j) — The Runner — to learn how a batter or runner is adjudged to have committed interference.
According to the Approved Ruling: In this situation, when a play is being made on the assisted runner, the runner is out and all other runners return to the bases occupied at the time of the interference (dead ball). If no play is been made on the assisted runner, the runner is out and play continues (delayed dead ball.)