Assalamu alaikum - My father’s close friend has passed, need advice

Assalamu alaikum everyone, My father’s closest business partner, Muhammed Kamaal (52M), passed away this afternoon after severe liver failure. Please keep him and his family in your duas. 😞 I’m sharing because this man was the one who helped my father pull the business back from a huge post-pandemic collapse. My dad seemed lighter and more at ease when he was around; he handled so much pressure and was honest and loyal in both business and life. A few days ago he came home after visiting the hospital and spoke to us - he seemed okay and insisted on surgery to try to fix his health. My father took responsibility to arrange the best care possible. After the surgery he was talking and walking, but yesterday he was moved to ICU and today he passed. I remember my father saying before he left for the hospital again, “if he’s gone, the whole business will be wiped out.” Everyone is in shock. I’m very emotionally shaken too - I loved him because of how much he cared for my father and our family. I need practical, kind advice on how to help my father through this trauma. My father is 45, and losing such a true friend is heavier than I imagined. What can I do to support him emotionally and help stabilize the business if possible? I’m 19M from Kerala, India, and I’ve been living away from home for 8 years for studies. I have about 4 more years left at the same institution. I have two younger brothers and an older brother who is working abroad, so aside from being physically far, I feel like I’m one of the main responsible ones now. NB: We’re going to visit his home today and make dua for him and his family - the immediate rites are being handled. Any practical steps, duas to recite, or suggestions for talking to my father or handling business matters would be really appreciated. JazakAllahu khair.