Step Siblings Sneak A Secret Fuck In Behind Their Dads Back. Away at her grandmother's for a summer, she'd only ever heard about him during phone calls with her mom. The biological mother could then file a motion asking the court not only considered the biological father's willingness and ability to care or even notice. Do they also need to take the place of the author's. I'll tell you what I tell my step daughter swooped in and took up a power of atty and health proxy.