Teenagers are good for nothing, as far as responsibilities of any kind are concerned.
They are still evolving mentally, spiritually to become thinking and decision making adults.
They in the process of transformation from child to grown up.
You can not count on them if you smart.
Especially with your baby. Looks like if they don't do something wrong with the baby, they will with your husband, because they dint know.
They can not see that far ahead what is actually going on ...
It is the husbands fault to use this teen. He is a dirt bag and child abuser. He took advantage of that person (to be). If child tells you jump out of a window are you going to?... You know better grand pa. You are old. Is that wise? You are not a man.
Head of the family, protector of women and children, faithful husband, keeper of promises,
a hero... A MAN.