I have a 90 year old volunteer dating an 85 year old volunteer.  Recently, he has become increasingly protective of her.  She is beginning to fail some.  He says I am too hard on the older volunteers and was unprofessional in raising his voice etc.  I understand this has more to do with her failings and he will probably act out more as she goes down more.  He is a member of our Foundation and has a son who is a doctor.  How should I handle his being uncooperative?  How do you address a volunteer who does not want to retire but needs to?