My dad totally forgot about us

So a few days ago my mom decided that she can’t take my dad’s bullshit anymore and that she wanted a divorce after they had an argument and he told her “so, get out then” basically kicking her out of the house. They always argue and I always wanted them to get divorced because I can’t take it anymore either. They’ve been married for 18 years and I don’t think she was very happy about their marriage, she was only 17 when she married my dad, he was 21. Anyway now we’re at my grandmas house, with a few money, no job, no place to stay in, no nothing. My dad haven’t talked to us (me and my siblings) since the day we left, he only texted my mom to say he’s “sorry” which she obviously didn’t accept, but she when she told us she looked a little bit hesitant because we don’t have enough money and my dad doesn’t send anything or ask us if we wanted something( my plan is to ask him this morning because he’s taking my little brother for his appointment at the hospital). I didn’t think that it would be this shitty 7 years ago when I prayed they get divorced, I just hope everything goes well and my mom gets stronger and finally find a job.