Seriously? Why on earth would you want to have a case reopened when it was dismissed? You are taking a huge risk, even if you could reopen the case, which is not likely. As for the outcome, there is no way of knowing. Get over it and move on. Your attorney got you a great deal.
It is not up to you to decide how your parents' inheritance should be distributed. If your mother never made provisions for a disproportionate distribution, then there is little that can be done by her survivors/heirs. While you may feel this is unfair, your parents made the provisions for their estates. If you wish to contest the will, you need to retain a good probate attorney.
Yes, your wife might be entitled to a portion of your settlement, but that is not written in stone. Many factors go into the determination of if, and if so, how much. If you are in divorce proceedings, you need to discuss this matter with your attorney.