[X] Approach Lady Mallery first, as an ally and one who knows much of the Lannisters' activities, and why she is very, very astute for thinking ill of the Lannisters' intent and should be alarmed that they are anywhere near her kin, since they shouldn't be trusted with their own kin, let alone the sons and daughters of other noble Houses. -[X] Using divination, your native grasp of human psychology and advice from your mother on how to make this approach. Once we have gotten her firmly informed on the absolute worst case scenarios--with the best case being the Lannisters having a hostage and offer little of actual value to House Mallery in truth beyond the promise of violence--their son is likely now a prisoner in his own body thanks to the careless actions of Lord Mallery... or was it? --[X] While you are at it shoot some divination toward what might have been done to Lord Mallery and his now-hostage son, as it could greatly effect the outcome of every conversation to follow. -[X] If they're not above binding noble scions of prominent Crownlander Houses--and you know Tywin isn't beyond binding his own Lords for certain--what stops them from enchanting a Lord into selling his children into slavery with a smile on his face and thanking them for the privilege? --[X] Send Varys to keep watch on Lord Mallery and if necessary ensure his safety. Give her another Sending Stone and Teleport charm in case of emergency.