A "negative" is a physical image in a light-sensitive chemical coating on plastic film, so if that is what you mean, that "8MP" is not correct.
Pixel count refers only to digital cameras, not film ones.
Either way, assuming the image was taken on a reasonably good-quality camera and was not blurred by poor camera setting or shake, or by object-movement, you would not be able to sharpen that any further without harming the contrast. In fact it is as probably of as high a quality as possible.
However, as I assume you have no photographic darkroom and equipment (if you did you would not be asking!) you need take film negatives to a specialist photography shop if you want decent results.
It is not very likely photographic films can be handled in the camera corner of the local supermarket-type domestic-appliance dealers, or even the chemist's - who used to be agents for film manufacturers and developers - but you might be lucky and find one with a professional-grade scanner/processor/printer using the correct photographic paper. Or who is still such an agent.
If they are digital images, assuming your computer can still read them, or if they are film negatives you can scan, you can edit them yourself in a proprietory programme like "Photoshop" but please do remember:
- what you see on the monitor is not necessarily what will appear on the paper,
- and most ordinary home/ office scanner/printers are really for everyday documents not high-grade photographs, so don't expect film-image quality even with "photographic" (glossy) paper. Nor longevity - their colour inks are not very light-fast at all.
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You can use a scanner and a photo-editing programme on a film negative or positive, but you are very unlikely to obtain first-class results with maximum fidelity and longevity of print, with an ordinary home computer and scanner/printer.
Either way, film or digital, if you really want the best possible for both quality and longevity out of these old photographs they need professional equipment, materials and attention. Otherwise you are likely only to waste costly printer ink on down-graded images that might not even last very long.
