We never knew how resentful my sister in law was against my husband until my father in law died and left my husband as executor of his estate, and trustee of his trusts.
My sister in law severed direct communications and insisted that all communications go through her attorney. She objected to court accountings and denied receiving household effects and funds that she had received. Her complaints were unfounded, but it took a great deal of time and money to prove it.
Most of the estate went to the attorneys, who spent seven years answering her many many claims. She is still bitter and hateful toward him.
I'm looking forward to that in the next several years.....my SIL is a royal B....
You can bet that if there are closet jerks in the family they'll come out when there is an estate to be settled.