Hi,
What a sad situation for you and your mother! She obviously has some serious issues going on. That must be difficult for you. Besides her husband not being very helpful. Plus the other family members who don't seem interested. I would suggest that at this point you just turn everything over to God. Ask him for his help and guidance and you will receive it. I recently had a husband who had lung cancer and died in July, 2024. Family members ignored his illness when we needed them the most. It was hard to deal with but we both prayed a lot and God answered our prayers. My husband did die but I know he's up in Heaven with God and Jesus and out of pain. We'll be together again, in God's time. It's just hard waiting! I'll say a prayer for you and your family. I wish you the best.
PML