That's more or less how I actually untangled the three family groups I mentioned earlier. That was the group that one LR had tangled, through looking only at easily available on-line, and that other LRs had blithely followed.
All three "batches" of children had the same father's name.
Births spread over 40 (!) years, if I recall correctly.
But each wife had a different name.
One batch often had a location mentioned in connection with recorded events.
And here and there were mentions of the fathers' jobs.
Found the marriages of each man.
That lot all helped to organise information before going any deeper, and then...
Found burial of one wife, and burial of child on next day, linked to father's name & occupation (But that hadn't stopped someone "giving" child a whole life and family, and bundling it in with all the rest).
Created a table to jhelp me sort out birth/baptisms, etc..
Eliminated from being held in same family all 3 surviving siblings with same name and ages within 8 months....
Then started looking more deeply. Sorted "my" lot out from the other two quite quickly. From interest carried on trying to sort others into sep. families.
Found another wife death, plus a remarriage and two more children.... for one man
Then got REALLY serious, started really looking, and sorted them out, apart from one un-named child and a "John" I couldn't pin....
Provided chapter and verse on my findings to the LR with the biggest tree .... but it did mean his own ancestry would not be what he thought it was..... wonder why I thought it was a "He" - can't remember now. ..... but of course, never a reply, and tree remained unchanged. Quite glad he's not really that close a relative as he seemed to think!!!!
I'm delighted if someone suggests a correction / alternative to me.... then we can check it out, and hopefully learn a little more, a little more certainly. It's always good to go on learning.