Keep in mind that if you take these children into your life, you may be inviting your ex back into your life more or less. Once she reaches a semi-reasonable state, she'll approach you about being in their child's lives. Or rather, the children would get curious about getting to know their biological mother. This could get hairy - especially if you now have another wife/gf and other kids.

My advice to you would be to investigate if the children's aunts/uncles or grandparents (both from your ex and the biological father's family) would be interested in taking in the kids. They can provide a loving, protective environment for the children and are probably more willing to deal with your ex than you are.

I am surprised it wasn't your first instinct that's what I do when ever life is giving me trouble, I pray to allah

I definitely would pray first and foremost. My second suggestion was going to be that if you could afford it and have the space and ability that you should take them in. I see that you have 3 of your own as well as a girlfriend who has 3 children so that seems like it would be quite the family. I grew up as youngest of 7 children, but I loved it. I know you kind of feel some responsibility, but they are not your children and unfortunately this situation is not uncommon. There is a family that is willing to adopt them so I would let them. If the children grow up wanting some questions answered or want to contact family, you could always leave your info with the foster family and the agency. But I would take some solace in knowing that at least they are going to a family.

Explain.

And why the hell are you calling him/her "it"?

this is why you should avoid crazy hoes

Has this been posted on VGC's resident lawyer, NoName's wall yet?

If the primary reason for holding up on the kids being eligible for a foster home is you may want your biological children to be able to perhaps send them a photo one day in the future- that does not sound like a good enough reason to hold up the process. From a purelY legal standpoint t either take them in or let them go - Then work on things like future contact and sending photos
Of you are willing to take them in yourself if you are not comfortable with thier foster situation then you should see a lawyer first - if not don t keep these kids ( for even 1 day) from being able to move into presumably better circumstances than they are in now

wait is this serious?

Wait, so there are 8 kids in question here? 5 biologically not yours, 3 that biologically are; 6 you wish to raise and 2 do not wish to raise but want to keep tabs on to make sure no abuse goes on?

Wow, and here I am nervous about one hypothetical child.

My advice, like others, is to consult professionals to cover yourself in this regard.

At this stage I would start by cutting off your penis, as for the kids you have to do what's best for the children who are yours, if the others are going into foster care it would maybe be best to just allow the state to take care of them. I don't mean to sound mean to you but if you have cash issues getting a lawyer for legal help then you probably couldn't provide the same lvl of care that the kid with needs will get when he/she enters state funded care.
I had the oppertunity to be a carer here for a kid who had special needs for close to a year while his mother was in Jail and I have to say between the state making sure that the kid is happy they really make sure that we had enough extra cash etc to get all the stuff he needed to be able to attend school, he was far better off because of it, just saying that you shouldn't worry too much about the ones in foster care, if it's anything like here the state will be very careful who gets to love and take care of those kids, because if they hand some kid over to someone who might hurt the child then the state is liable for that.
Like I said tho love the kids you have direct care over, it might be less confusing for the other kids to not know their full life stories if it envolves abuse at the hands of their mother, that is very hard for a child to understand why a mom would do that if they have friends with traditional familys or so.