For the first session, the pairs can be assigned their position randomly, sorted by age or any other means. Games are timed so all start and end at the same time. When recording results, the first record is the win or loss. Then you put down the point differential. If they are tied then they play rally point and win by one.
Final results are on wins first and all ties are broken with point differential.
Each time period constitutes a full 4 person round robin as follows.