Double check everything Aunt Myrtle wrote in the family history in 1952. While most of it may be correct, it is possible that the renegade relative was left out to make the family "look better" and that a date of birth or marriage was altered slightly to be more socially acceptable.
Don't throw out the entire book just because of a few errors. Aunt Myrtle had access to people who are now dead, tombstones that are now gone, and records that may no longer exist.
Like any published material, use Aunt Myrtle's publication with a careful eye.
And be glad she wrote it. Most of us are not that fortunate.