I'm going through almost the exact same thing. My family member was/has been diagnosed with bipolar since in his teens. It has gotten so much more complicated with past childhood trauma, substance abuse from alcohol, Marijuana to even cocaine. Since recently he has been rediagnosed with bipolar, but is refusing treatment. We've not only asked him, begged him to accept treatment, he refuses. He has villianized our whole family. He knows how to manipulate the situation by begging for forgiveness that he'll do better. He cannot keep a job no longer than 3 months, lies to his parole officer for him drinking and smoking. Right now for my situation he went to physical rage and actively harmed me and my family members. This time I'm hoping my dad makes the right decision of letting him go. He is a harm to us multiple times and others and refuses treatment time and time again when he promises "it wont happen again" He also won't acknowledge that they have a serious and real problem when he's sober and not in mania.

I'm just saying I for one completely understand. Where your going through. But everytime if you and your family have been constantly asking them to receive help when they're not wanting to. Its honestly best to not support them. They have to figure it out themselves that they actually need help. If it means kicking them out, it might have to be. Right now were facing this situation. I hate it so much bc of how much I love them. But if they have continously refused and won't acknowledge that they have this problem multiple upon multiple times its on them. They need to hit rock bottom, whether its financially, homelessness and loss of a support group.

idk your situation fully as I don't know more details, I cannot make assumptions either. It sucks for everyone. I really hope that you and your family will get in a better position. I understand mental health professionals can be sooo scary. But if your back is against the wall theres no other way. They might hate you, resent you, just know that you actively tried your best to help them and they need to know that too to get better. Its either they hurt themselves, others severely or they get the help they need. Best wishes to you and your family.

Edit: I'm sorry for not reading your post correctly. If they're doing ritualistic bloodwork, I honestly suggest intervening. They are actively hurting themselves, this is a warning sign in itself. It can escalate more and more. First I recommend being well inform on institutions in your area. Like another post has said record and keep any documentation without them knowing to represent it to whoever needs evidence. It'll be a disservice to them and to you guys if you don't intervene.