Can a person that is commited to a state mental hospital have a will?

I am a lawyere in CT and practice in this area of the law.  The rule regarding wills is that anyone that is competent can make a will.  competency is generallyl defined as knowing the nature of your assets/property.  indeed, this is a very low standard.  however, there is no requirement that you must have a will.  if you do not have a will, the rule is that the decedent's property passes to the next closest heir on the bloodline.  therefore, i suggest that an estate is set up.  you need to see a lawyer to help you here.  you need to set up and estate and have an executor appointed to disburse your grandfather's property to the lawful heirs.  then the property may be sold.  you need to see a lawyer to help you.