@ace mooha plz don't fall under peer pressure, you are smarter than that. But if you insisted in revenge, follow this plan. First find pictures of the old man(dad) through social media (hack them). Second, photoshopped him with under age kids(yes with kids)
Third, distributed the pictures in his social circles ( neighbours, work, cars, family) trust me you killed him social (no one will forgive him even his sons will be scare for their kids from him) the family will be boycotted.
But if you don't want too much work, easy thing photoshop the old man picture in sex crimes wanted flyer (sex offenders wanted) and distributed in his mosque, neighbourhood (supermarket, mall, neighbor'cars, trees, work) but don't dirt your hands.