Sample leave application letter from mother to school principal

To
The Principal 
School Name
Place

Sir

Kindly grant leave-for-sickness to my son on ____________________ (date) and ____________________ (date) when he was unable to attend the school, as he was running high temperature; and we were so much worried about him that we could not even think of putting in an application on his behalf.

My son, _________________ (name), Class ______________________, Section _________________________, has been advised by the doctor to take complete rest for at least a full week.

Therefore, kindly grant him leave up to ________________________ (date) of his month.

Yours faithfully

Name