In the letter requesting a leave for a medical treatment for your father you should mention the time you will be missing from work. You can also write about your plan to make up for the lost work.
Begin with the respectful greeting, "Dear Sir or Madam:" and write what you are requesting.
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How do I write a letter requesting financial aid for a christian eduucation for my child?
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You should include in the letter why you are requesting leave. You should also include in the letter when you intend on returning back to work.
How to write a request letter requesting official quarters.
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You can write a letter requesting a farm land relocation by first making sure that you are addressing the proper authorities and then stating the reasons for the relocation clearly.