Spouse, Step-child and Support

What financial obligations will I have for a step-child after a divorce? His birth father pays very little support and his mother will not keep a job. She had 11 W2 forms from jobs she quit in 2007 and almost as many for 2008. Many jobs she quit after less than one day. Will her employment record show a trend in her employment behavior that will work in my favor concerning support or alimony awarded to her?

If you have not adopted the child you have no legal obligation to support the child after you leave the home, though you may have an alimony obligation to your wife depending on your specific circumstances. If your wife is capable of working and simply refused to, the court can impute income to her to lessen her demonstrated need. (which does not include the needs of her child)