Dear [Elderly Friend],
I hope this letter finds you well. I am writing to you today to address an issue that has been causing strain in our relationship. You may be aware that my relationship with my father has been strained for some time now. This has been in part due to some advice that you gave him, which caused him to take actions that have negatively impacted our relationship.
I want to make it clear that I value and appreciate your friendship, and I hope that we can continue to have a positive relationship in the future. However, I also want to express my disappointment with the advice that you gave my father, and the negative impact it has had on our relationship.
I would like to ask that you consider the potential consequences of your advice in the future, and to think about how it may affect the relationships of those around you. I would also like to discuss this issue with you further, and would appreciate the opportunity to do so in person.
Thank you for your understanding and I look forward to hearing from you soon.
Sincerely,
[Your Name]