It may be that some of their behavior is old age. Some of it may be just family conflict. You know your family's history. If they are 76 you may have to solve issues by giving into to some of their temperament. That doesn't mean you should be abused. You should be able to talk to them without feeling like a child. You both have your own feelings about your situation and you have to find a new way to communicate which compensates for their age. In their mind they saw you as upsetting them. That is common. Older people often feel that others are upsetting them or getting on their nerves. You may have to practice this avoiding a little but more as they grow older.
If this is helpful press accept