I have a theory...
[spoiler]When Quentin first shows up in 1969, perhaps the Leviathans saw him as a threat and "made" the family remember his hauntings so that he couldn't be trusted. When they were defeated, the memories were wiped away.[/spoiler]
I read Warren Oddsons essays on 1840 and Parallel Time 1970, but not about 1897. Does anyone know where to find it? It isnt in the 1897 Concordance Part 1, perhaps it'll be in Part 2.