NEVER TRUST ANYONE ELSE'S TREE. A lesson most of us have learned the hard way.
ALWAYS check out the references (if they give any) and find your own evidence if they don’t.
Many many folk here just copy great hunks of each other’s trees without even bothering to read what they are copying, believe me finding children born after both parents have died is nothing. I’ve seen trees where ALL the children were born, married and died BEFORE the parents were alive.
When all comes to all YOU are responsible for YOUR TREE, if you want it to be remotely accurate always check your sources; if you just want thousands of people on it then by all means copy everyone else’s work. Your decision.