Canon Background
https://awoiaf.westeros.org/index.php/Bethany_Redwyne

In-Campaign
After Septa Selyse had stalled the party from House Jasper for a day Lady Bethany granted them an audience with her (with the septa present to advise). Their leader, a blustery and reckless knight named Carsen, explained they had traveled across the realm to claim Berta (her eldest child) as a ward for Lord Jasper as ordered by Lord Arryn, Hand of the King. As the conversation escalated and violence was threatened Selyse and Bethany fled, looking for protection by Lord Mathis.