When working out any lineage, especially a new one, keep approximate years of birth in mind for the parents, children, grandparents, etc. and always be asking yourself "Could these people be old enough to have these children/grandchildren?"
It won't help you catch every mistake, but there will be the occasional one.
I thought the ages for a recent "theory" of my own did not fit, but realized that a man born in 1770 could have a son born in 1788 and that son could easily have also had a son born in 1819.
Sometimes the ages will make you realize the people you think fit together, do not.
And other times it means you've got more research to do.