On the upcoming season finale of Brothers & Sisters, "Mexico," Saul has an admission about Ryan's mother:

He may have caused her death!

In other finale news, E! Online details how Walkers are Mexico-bound this Sunday. Their goal? To bring Tommy back to America.

Meanwhile, Kitty and Robert finally reconcile, while Justin and Rebecca announce they're getting hitched! He even pulls out a makeshift ring and gets down on one knee.

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