This family is sooo confusing--they keep branching off in all directions and like a lot of families, love to use the same Christian name over and over, which makes it almost impossible to tell who is who!!
About the dates: Yes, I've banged my head against the wall over impossible dates so much it's a miracle I don't have severe brain damage (or maybe I do, lol!). I suspect what happens is that after awhile (if you go far enough back in a family line) ppl start "guess-timating" dates of birth, marriage, and death. For the first few generations, this might not cause a major problem--but if your dates are only a little "off", over just a few generations they grow into HUGE discrepancies. At least that's my speculation on that, for what it's worth!
Aarrgghh--I get a headache just trying to keep all the names straight--never mind the dates lol!