Get a larger audience for your letters!
If you have been putting off writing a letter to an unknown fifth cousin, because you have to actually mail it and you aren’t sure if she will respond and you have to find a stamp and you aren’t sure what to write, etc. then, this is the time to do it.
It is likely that more people will be in the house for the Thanksgiving holiday dinner and one of those people might just be interested in genealogy. A letter mailed in July just may not have the audience. It will give the family a potentially non confrontation discussion point. Just do it.