“My husband is planning to write his last will testament stating that, at the time of his death, his body will be buried in the Philippines and that he is giving me all the rights and authority to claim his pension, Social Security and whatever other claims there may be. Were living in Waltham, MA. USA. Do we have to notarize it or is it acceptable as long as it is his handwriting.”
The estate and testamentary laws of every state are different, and in particular are very state-specific when it comes to a holographic (hand-written) will. As such, you should consult with an estate planning attorney in Massachusetts.