Yes, you can leave half to your son with his share going to your daughter if he fails to survive you for a set period, such as 30 days. If you already have a trust, it probably already provides for his share to go to your son's children if your son fails to survive you, and if he has no children then it goes to your other children, not to the daughter-in-law. If not, you should have a will drawn up to express your wishes or, if you already have a will or a trust, they should be amended if they do not already provide what you have indicated are your wishes. Has he adopted his wife's daughter? If so, your will should specifically disinherit the step-granddaughter, otherwise she would likely be able to claim an intestate share as a pretermitted heir. The drafting attorney can explain that to you.
Answered on Jun 30th, 2015 at 3:50 PM