>>5008621>get his kids info>find out their habits, schedule, jobs, lives, ect>spend 6 months to make yourself the perfect mirror of your half sister>contact them with info from police>"omg I'm so sorry, [dad name] was very close to my father when they were young, and he was like an uncle to me">gain her trust, make yourself seem vulnerable>she realizes you and her have a lot in common>fuck herThe final insult to your no good father!