you can always enclose your lanai
not a bad idea with all the heavy rain that we get here....makes the room usable regardless of the weather
doubtful that there is any tactful way to get him to understand that he really is an awful singer...most likely he needs hearing aids and has no idea that he's being too loud
maybe you could consider inviting them over for cocktails....after a few let him know that you can hear him singing...he may not even realize that he's that loud
good luck...not an easy one for sure
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