1.Solve getting them out of the house first
Everything else is easy. You need three clear hours and a reason that does not make them suspicious. The best accomplice is someone who is not obviously part of the celebration: a cousin who needs help buying something, a friend taking them to an appointment, a parent who wants company at the market. Brief that person on the exact return time and make them text you when they leave to come back. Never rely on the birthday person being naturally slow.



