My Advice:
1.) Keep it short stupid!
2.) Entire text of letter: “My first priority will always be that [my son] have as” little National Debt to pay off as possible. Therefore, I will NEVER vote for ANY Candidate who supports Re-Distribution Communism, “from each according to his ability, and to each according to his need.” (Karl Marx)
3.) Close with “The Father of your Grandson [Grandson’s name], and sign with [Your Name].
4.) Ask your wife if she wants domestic peace with her Dad, or low National Debt for her son. Point out that the two are mutually exclusive.
5.) Wait for the ice to thaw in your house, and then mail the letter.
BTW, Winter is approaching so this might take awhile - - - .
Perfect. (don’t you love days like that?)