My wife has hair in upper lips. how can we remove that? and how long it will take? is there any home remedies?

Upper lip hair: This sounds a pure cosmetic nuisance. There is a # of over-the-counter products that may help her shave/peel the unwanted hair. The drawback is that the hair will recur and some of those products may be associated with significant but usually short lived discomfort during their use. Laser removal or electrolysis are more permanent ways to get rid of that. They can also be painful and also costly.