Re: Outdoor hardwood floor
If your exterior oak floor sees any sunlight or weather, you must realize you're committing yourself to a yearly maintenance regimen by going with a clear finish. If the finish breaks down anywhere, the oak will rapidly turn gray, and once it's discolored in spots, the whole area has to be sanded to restore the appearance.
Clear finished, unsheltered exterior woodwork of any kind is too much of a hassle IMO.
Remove not the ancient landmark, which your fathers have set.