My Father is talking to himself. What can I do to help him, he didn't like to go to a therapist?

My father started talking to himself when I was 9 years old until now that I'm 19 . My Mum is working in abroad from my childhood until now, she only came home a weeks or months .. My father is the one who took care of us, we're 2 siblings , I'm the youngest , I always cried at my room , easily irritate to him because he is always talking alone from morning till night , he is quite only for a minutes or when he is sleep, it is my struggle until now , he don't want to go to a therapist also . Sometimes we are fighting because i got angry bcoz of he's noisiness .. even in public also he don't mind if there's people around , but he is normal when I talked or asked him,he's answer is right. My Mom told me to understand him and pray to Jesus to heal my father , I always did it. I need your help ... I also felt lonely already and shy to my friends . i always isolate myself at my room and listening music with headset,, I'm so tired , but I can't throw my father I loved him so much , My Mum is in abroad until now . I felt no one cares to us , and there's a gossipers around us in our community.