A man must always take credit for his flatulence in the company of other men

The only other man whos duaghter is not offlimits is your boss

You Might try either scanning the negatives themselves with a negative scanner, or finding a local proffesional photographer and have him reprint the photos in bigger sizes, the technology has improved a lot making bigger print cheaper and easier so you can probably gain more physical detail by doing it that way than scanning the pictures itself at a higher res