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Imagine if you were writing to a close friend and accidentally swapped letters and envelopes. That's what you are going to do for this swap. You are going to send your partner a fictional letter detailing some family drama.
Your envelope will be addressed to your partner (How else would they get it?) but the letter inside will be addressed to a fictional person. Your letter should detail some family drama. Make it salacious, make it dramatic, make it interesting.
The length of the letter is the equivalent of one A4 sheet of paper. Feel free to write more if you want to. Any similarity to real people or places is purely coincidental.