Dear [Recipient's Name],
After giving considerable thought, I have decided to resign due to unavoidable personal issues within my family. These circumstances prevent me from continuing my services any longer.
Although it was a difficult decision to step away from such a pleasant working environment, there are times in life when we must prioritize family matters. It is with this in mind that I have chosen to tender my resignation after thorough consideration.
Please accept my resignation and process my release at your earliest convenience.
Warm Regards