I found a tree earlier this week where the person seemed to be hedging her bets. She had a man married with 7 children, names of children and wife all correct, places they lived on various census all correct, then for some unknown reason she had him in the navy and had attached proof with a form giving his name and lots of other sailors! The only problem was at the time he was supposed to be in the navy he was living with his wife and 7 children and working as a labourer.
I've no idea why she suddenly threw in the naval man, but it certainly wasn't the same man as the rest of her tree.