Yes, if the child is an adult. You will need to make it clear in your will that you are deliberately leaving nothing to that child. However, to prevent bad feelings between your children after your death, it might be wise to leave a small bequest to the one who doesn't help and then state you are leaving the majority of your estate to the other because of the assistance he or she provided to you during your life.
Answered on Sep 05th, 2013 at 3:50 PM