'The Affair' Child Stars -- Tween Pulls More Green Than Teen ... For Now

If Showtime's "The Affair" actor Jake Siciliano feels a tiny sting every time he goes on set ... it's because the 16-year-old is making a grand less per episode than his 11-year-old co-star.

We got a hold of Jake's contract and tweener Jadon Sand's (they play the Solloway bros). Jadon is set to pull in $11K/episode for the first season while elder statesman Jake only gets $10K. But if the show's a hit, Jake will start crushing Jadon.

According to the docs, Jake gets a $1,000 boost for the next 2 seasons -- and then 5% bumps for seasons 4, 5, and 6. Meanwhile, Jadon only gets a flat 5% raise every season going forward.

Bottom line -- a little sibling rivalry is always good for the piggy bank.