Mom came home saying Dad wants a divorce, I don't know how to take care of her

I came here because I don't know where else to turn or who to ask. A few hours ago, my mom came home and said my dad wants a divorce and he's not coming back. I asked her what happened, she said nothing, but I know what it is-infidelity from my dad. It's 5 am, she's in her room, and I don't know if she's asleep. She told me to go to sleep. I'm 20 and the eldest of my siblings. Even though he said he wants a divorce, I'm not sure if they'll go through with it. Until then, I don't know what to do or how to take care of my mom. I never know how to show emotions with my family. I thought about going to her room in the morning and asking if she wants something or breakfast, but I genuinely don't know what else to do. I also don't know if I should tell my younger siblings, who are 15 and 16, or not. I'm very lost right now. I've been continuously making dua lately for Allah to protect my family and my parents' marriage, even though this divorce thing was sudden and not mentioned before. I was making dua on my own because I wanted my family to be protected. I would really like some advice, and if you could make dua for my family to be protected, I'd appreciate it.