Eight stemming from repetitive Smart Matches (mainly minor birthdate discrepancies).
Two red flags caused by the following children: David Armstrong Symon Armstrong
David Armstrong has a MP sibling: David Drummond, 2nd Lord Drummond
Worthy of mention (perhaps) is that both Davids are married to the same woman: Lilias Armstrong Lilias Ruthven
I suspect some kind of mixup between the Davids and Lilias Ruthven. We have a source for David Drummond but not for David Armstrong. For Symon Armstrong we have only one dubious Smart Match.