Respected Principal,
I am writing this letter to request a leave of absence from school due to a family emergency.
My father has been diagnosed with a serious illness and I need to be with him for his treatment. I am the only son in my family and it is my responsibility to take care of my father. I have already discussed this with my teachers and they have agreed to give me the time off I need.
I understand that this is an inconvenience for the school and I apologize for any disruption this may cause. I assure you that I will make up for any missed work and I will do my best to keep up with my studies.
I would be grateful if you could grant me leave for the next two weeks. I will be available to answer any questions or provide any information you may need.
Thank you for your understanding and consideration.
Sincerely,
[Your Name]