My neighbor has had 2 trees fall on my house in 2 months. He says it's my problem.

[Jean-Thierry Aleman]

My neighbor has had 2 trees fall on my house in 2 months. He says it's my problem and won't even help with my deductible for what is now 2 separate insurance claims.  Legally he is correct.  In the state of Florida, anything that comes over my fence line is my responsibility.  My insurance agent instructed me to write a certified letter to him to have any trees I am concerned with cut and or removed by a licensed arborist.  This will then put the responsibility on him legally should any further instances occur.  Does anybody here have experience with similar situations?  I want to craft the best letter possible to cover my A$$.

Thanks in advance!