While a service like Legal Zoom may be sufficient , it ' s not something most people in the legal profession would recommend . Depending on how many assets your father has that would be subject to a will i . e . excluding jointly owned property which would go automatically to the surviving owner , joint bank accounts which would go automatically to the surviving account holder , life insurances which would go to the named beneficiaryies , etc , and especially since there is the prospect of a challenge to the will , I would definitely consult with a lawyer . A lawyer can certainly draw up a will in less than a month , and will also be able to advise on how to prevent or minimise the chances of success of any challenge , and also help with any challenges that arise later . One further option is to gift assets now while your father is still alive and mentally competent . Ideally you would also consult a lawyer to make sure that these gifts can ' t be challenged , but at the very least , given his poor health , ensure you have a letter from his PCP attesting that he was of sound mind at the time of making these gifts .