How can I write a letter to request leave for a medical treatment for my son?
In the US, you are entitled to family leave (FMLA) and you should be able to obtain the proper forms from your human resources department. You will still need to use your vacation and sick time or go unpaid, but it will allow you to keep your job and your health insurance going. You may also be able to get intermittent FMLA, which you use as you need it. This keeps your attendance record intact.
