If they are flying within the constraints of FAA regulations and local ordinances, you have no legal recourse for whatever actions you choose to interfere with the drone in operation. 'You' being the generic 'you'. People may find themselves in a world of Federal hurt for downing a drone in an unsafe manner, in addition to any civil or criminal property damage statutes. It's just a fact. Your best bet is to talk to the individual, or see if they are violating the regs or local ordinances. You can look up your in-laws address on Airmap or Skyvector to see if the airspace is legal to fly in. Amongst other things, I am a licensed commercial drone operator.