Missing cat. Please help me and my family know his whereabouts

Hello everyone. This is Theo. As shown in the image, he has been missing since January of this year. Him and his brother have always been outdoor cats and one day he left and hasn’t came back since. Me and my family miss him so much and we want to know if he’s okay. It hurts to tell others that I have 3 pets knowing that it should still be 4. If you have seen him or even have him. Please text the number in the image. Thank you so much🙏