RedactedNarrative: Operator of V1 stated they were traveling west and had slowed down for some waves.  At that time Operator of V2 hit them from the stern. Everyone except V1's operator was ejected.  Damage indicates that V2 entered V1 from the stern, traveled through the port side and exited near the bow on the port side. V1 had damage to the back section of the seat near the stern and down the port side of the vessel.  V2 had damage to the starboard bow and down the starboard side.  Operator2's inattention and experience were at fault.  Vicitms suffered their injuries from impacting their vessel.