Actually said no

I didn't think I would be able to do it, but I said no to DSS. They asked me to take a teen boy, only for a respite weekend. But it happens to be a weekend where it would just be me with the kids. Every scenario ran through my head and I am just not comfortable taking a kid I don't know, not knowing how personalities will mesh. I have been so busy as is, I don't want to add to my responsibilities. But I still hate to say no, and I feel guilty, but I have to think about this household first.