You see, it's all about creating an environment of uncertainty. Leave a trail of dirty dishes, a trail of broken appliances, and a trail of cryptic notes on the fridge that read "I'm watching you."
Step 1: Place an old, non-stick pan on the counter and stare at it for 5 minutes. This creates a sense of unease.
Step 2: Set an alarm clock to go off at 4 AM and place it under the sister's bed.
Step 3: Create a hidden camera using only a toaster, a can of tuna, and some tin foil. Place it in a conspicuous location like the top shelf of the pantry.
Continue to Technique 2: Infiltrating the Sister's Computer