Real estate advice, no will left behind by my late father.

Hi good day, I wanted to get a secured loan using my late father house, however there is no will that states I'm the legal owner of the house. The bank requires a resolution letter or a letter that states I'm the new owner of the house. I have the tittle deed but he is the only one who appears on the tittle deed, I also have his death certificate. Any advice will help thank you.