Whilst Marty and Wendy struggle with their power dynamic, As outlined by showrunner Chris Mundy, they'll also be "handling outside the house forces" when Wendy’s brother Ben relates to city. Ben's previously been referenced as getting a history of mental illness and may be described as a "very destabilizing factor." http://emilianoczwpi.pages10.com/Animal-Kingdom-Seasons-1-2-An-Overview-30556288