After your spouse has died, the terminology for addressing your deceased spouse's parents largely depends on the specific cultural or personal preferences. Here are some common terms that might be used:
Father/Mother-in-law: If you had a good relationship with your spouse's parents and still feel connected to them, you may continue to refer to them as your father-in-law or mother-in-law.
Former Father/Mother-in-law: Some people might use the term "former" to indicate that the marriage connection no longer exists due to the death of the spouse.
Mr./Mrs. [Last Name]: In some cases, people may simply address their deceased spouse's parents by their last name as a sign of respect.
[First Name]: Depending on the relationship and level of informality, some individuals might continue to use the first names of their deceased spouse's parents.
It's essential to be sensitive and considerate of their feelings during this difficult time, so it's best to choose a term that feels comfortable and appropriate for both parties. If in doubt, you could ask them directly how they would prefer to be addressed.