You'll know much more when you get the death certs,they will have an address where each of them died on it,giving you a much better idea of which was the nearest church or cemetery.
I was thinking today of all the babies they lost in each generation,Gertrude,the twins and then the baby born in the 1940's,before the chap who is still alive.
I will PM you tomorrow with a few more of my thoughts on how you might word a letter to him.
Carol