I think having a stepson is something you have to put up with, no matter what his problems are, as long as you want to be with his dad. 18 is not a grown-up age; however, if the father continues to support his dependency, you and your husband should expect to always support him. There has got to be a cutt-off period, the problem is at what age? Again 18yr olds can still be uncapable of maturity and independency, but it is you and your husband's job to teach him how to grow up