@MrsRyanGosling15
Well done to recognising this and talking about it.
Yy to what others said about your DH. He isn't doing the child care and often isn't there. It makes it a much easier decision for him.
I understand all your worries and would support you if you were friend or family. My big concern is that your anger for your parents who are useless and irresponsible, is clouding the issue hugely. I would worry that if you didn't take your sister, some time down the line you would be torn up about it.
Can you have some counselling now about your parents - even without the issue of guardianship, it would be a good idea. This amount of neglect and poor parenting would damage anyone. I think it would bring some peace of mind and you may be able to let go of some of the hurt and anger - this does not mean forgive and forget. It is your emotional well-being that is important here.
Also, would it be possible to get her assessed for FAS so if she has it, the right support can be lined up whether you are looking after her or not.
My advice to you is to look after yourself and your feelings, get some peace of mine. Also, try to get her an assessment. Ensure SS are involved and understand it is not just a case of placing her with her sisters. That may not happen. Sit your adult sister down and have a serious talk. Is she prepared to adopt little sister? Could you share custody? Can she talk to her husband about the issue so she knows what she should be letting herself in for? Single parent or married?
Approach the FAS charity/society. They're must be one. Find out what her future may look like. My friend adopted a toddler with FAS. The early years were hard and he was difficult and very obviously different. He struggled with social situations. Now, as adopted children have much support and she is resolute and tenacious in getting that help, as a young teen he is a different child. But it was hard and she did have to fight.
Tbh I would not be able to see a sibling go into care unless I knew the foster parents and could be involved and keep and eye on them. That said, I have a child with multiple SN and it is all encompassing and exhausting. His sibling does not get enough attention and it shows.
I wish you were my friend IRL - I think with some support and help, you could see this situation more clearly and whatever decision that was made, you would be prepared and could accept it without crushing guilt and sadness.
AWARE THAT COMMENT ABOUT IRL FRIEND MADE ME SOUND SUPER-SAD. Hope you get the gist!
Get help and gather knowledge. With those you can make your decision and live with it.
Make sure SS don't just dismiss you. They need to understand that this is not an uncomplicated family adoption. Your would need help including financial.