Idaho Code 152505(b) specifies that a will is not invalid because it is signed by an "interested witness." Idaho Code 151201(25) defines "interested person" to include heirs, devisees, children, spouses, creditors, beneficiaries and any others having a property right in or claim against the estate. So, yes, as the daughter in law of the will maker you can witness it. However, if only disinterested persons serve as the witnesses to the will, there is less opportunity to impeach their testimony by showing motive that a judge might take into account in deciding if you are telling the truth, if it comes to that in a will contest. So, I always use disinterested persons as witnesses, unless impractical.
Answered on Nov 21st, 2012 at 5:43 AM