Misrepresented

Hi guys and gals. We have a bit of a problem/concern. We have a little guy, MR, PTSD and a few others.... Here's the thing. We were told he was developmentally 6, though he's 12 (13 in a few days). We were told he's basic (though we're getting moderate reimbursement). He's NOT 6. He can be an infant one minute, a baby or even a toddler. There are some moments when he seems almost fine.... He needs to be micro managed. He can do basic things... dress, eat, go to school (though he's obviously in special ed), etc. He doesn't remember things from day to day, sometimes from minute to minute. He's been shown things and had things explained to him, well in one instance 12 times - but he doesn't seem to remember. On our ... request for what kind of child we'd prefer, we specified NO babies. We are an older couple with one boy who's 14. We knew we would NOT have the patience for a younger child. We specified 6ish and up, boy or girl. But this little guy is causing so much... grief. We like him but... He can't seem to do anything. He never goes outside, he sits and stares off in space. He doesn't want to do anything by himself. Doesn't do handheld computer games (sorry, I like that one it's a good reward, or loss of privlage thing), he can't / wont read, not even Beginning readers with help. He doesn't color.... He has to win at a game or its "I don't like this game, it's dumb." I don't have the time (cooking, cleaning, errands, etc, y'all know) to entertain this kid every waking moment.... Our case worker has said to decide if we want to keep him or not. He only gave us 48 hours, today's the day. He's been here 3 months. My BP is up... I have a few other minor problems that have been agitated. This little guy needs a male role model. My husband works 2nd shift. For all practical purposes, my husband is only avail on weekends. He has a therapist, but can't seem to remember what they talked about or what to work on. All this does is cause more tantrums...in addition to the almost daily ones anyway. My son says to let him go. My husband is leaning toward letting him stay. I am on the fence, but leaning toward letting him go. We're supposed to decide today, but I feel guilty. I don't want to upset this guys life again.... He's been through so much, but.... Will CPS NOT give us another child if we say, sorry, this one's too much for us? This is the little guy who seems to think our dog bit him, though the ER Dr said no. Regardless, I am also having to be a human shield. I have to make sure this little guys NEVER alone with that particular dog. And sometimes I just can't be "Johnnie on the spot." There's no way to be a human shield 24 / 7. There is another child here, plus I have my own needs. Any suggestions, words of support or anything? Y'all give such good advice. Thanks in advance.