Good morning. In a preview e-mail I had sent you all the explanation of the requirements that we need in order to issue the I20. Those documents had to be sent American Immigration. ALL THE REQUIRIMENTS MUST FOLLOW THE RULE. The bank letter that you had sent us did not specific the amount of money that your father has on the account. The letter must show how much money your father has in the account.
On the other hand, if your father is retired he must provide official documents of how much money he received weekly, bi-weekly or monthly.
Please again, read the preview e-mail that I had sent you. You must provide all the documents in order to issue the I20.