Was your first child a teen pregnacy as well? You have seven children, how did that happen? I wonder did you alread set a pattern for your children to follow? Maybe you should take steps to make sure your other children do not do the same.
I think for the sake of your other kids you need to tell or teach your kids about teen pregnacy and how to avoid it.
You daughter is going to have to get a part time job, or for the family excell at school. Plus she is going to have to look after her child. Even though she is a child, she has to grow up and take care of a life she is creating now.
Mr16 year old as well, better get out there and sell newspapers or something for his child and help support. If he will not, you can sue his parents for some kind of support I would say. He is a minor.
You do not have to pay for the whole thing, his parents, plus 16yearold himself should provide whatever support they can.