My father doesn't pray

Assalamu alaikum wa rahmatullahi wa barakatuh, dear brothers and sisters in Islam. I'm reaching out because my father doesn't pray his five daily prayers. My family, especially my grandfather, have tried advising him, but he refuses. I feel helpless, so I turn to Allah to forgive him and guide him. I fear for him and don't want him to be in Hellfire. Please, my brothers and sisters, make dua with me for his guidance. Perhaps someone more righteous than me can intercede. 😢