There seems to be "problems" with Ancestry trees; one of my "linked" trees is in "an unholy mess", though a few others* glanced at seem fine. Whether this is caused by the current "upgrade to Family-sync", a random event or because I connected to Ancestry with the latest FTM without thinking (resulting in a message that FTM 2017 is needed), a load of "new" marriages have been added: father/daughter, f-in-law/son-in-law and couples multi-linked with duplicated complete families .......
Phil
* I keep separate trees for each direct ancestor (DA), though each DA is in two trees, providing the linkage.