Dear Dad,

Send Proof of Life immediately. Your cooperation is crucial to Ruby's well-being. Failure to comply will result in...unpleasant consequences.

We are bored, there are no squirrels, and we require sustenance. Snacks are essential. Specifically, [mention specific snacks Ruby likes, e.g., "chocolate chip cookies and gummy bears"].

Your prompt action is required. Come out to [location] at [time] with the requested items. Any deviation from these instructions will be met with severe repercussions.

Love,

Ruby

P.S. This is not a game. Ruby's continued safety depends entirely on your immediate and complete compliance. If you do not comply, Ruby will be forced to [mention a consequence, e.g., "cease all communication," or "undergo a difficult task"]. Your prompt response is paramount.