Write to the public Library / Archives / Geneology of each town lived and died in. They have records on line of every state and every county. If you live in that town as they did, go to library and look it up yourself.
The addresses are on line for each state and county.. They have all kinds of records.census, marriage, wills, land, obits cemeteries where buried. Send $12.00 to get started. And any info you have, helps them search faster. Death certificates tell names of parents where the person will be buried.