When we took in our two grandchildren, one was 3.5 and the little boy we adopted was 5 months I called a woman who had went through a similar situation with her daughter and asked her what I should do first. She said get those Medical Cards RIGHT now, because if they are in your care, you are responsible for them, and one major illness or accident could ruin you for life. So, make sure you did that.
I am so honored to be part of a group of good people like this site shows. Not many people will put their hand out now, even if its family and help, especially with teens. I shudder to think what those boys have went through, and I still see a huge need to start doing more help in THIS country with this issue than taking so much money out of the country. We have no idea what some kids are going through right at this moment. God Bless you all and MIL, bless her heart. Keep us posted on how things are going!!! They might act out a little or a lot for awhile, but when the chips are down and they are older, they will know who stuck it out with them through the good and the bad.
I would also watch out for the mother; because we all know no matter how horrible things were with a parent, its STILL the kids parents and they have a "dream" that mommy or daddy is going to come back and save them. . .even in a good home. My daughter had a little best buddy that dreamed for years her dad was going to come and take her away to Florida where he lived. I think that is what got her through her years with a verbally abusive step-dad.
My thoughts and prayers are with you all!!