Yes, your sister can be a witness on your father's will as long as she is of legal age and mentally competent. However, in some jurisdictions, if she stands to inherit from the will, it may affect her ability to receive her inheritance. It's advisable to check local laws and consult with an attorney to ensure compliance with any specific regulations regarding witnesses to a will.
sister in law
Your fathers sister or fathers brothers female partner.
Yes
fathers elder brother ANSWER: your sister in law........
No
Cousins
sister friend
Rebbie Jackson is the only one who is still a witness.
fathers
Aunt
Aunty and Uncle.
Her father, unless the son and his sister have different fathers which would make him nothing to his son's sister.