Unfortunately, I can see right off that most of those knives are very inexpensive (ones marked Smith & Wesson, UZI, Winchester, "Sheffield", Jaguar, "Navy"). It's possible that all are very inexpensive.
The one knife marked "Spyderco" looks like a counterfeit Spyderco Rubicon to me. And if there is one counterfeit, their might be others. The Strider folder in particular is one I would be suspicious of because there are a lot of fake Strider knives out there.
This is not a knock against your father. It's not at all uncommon for unsuspecting people to buy knives not realizing they are counterfeits.
The ones marked CRKT, Boker, Kriegar, Gerber, SOG, Schrade, and Byrd, are also not valuable knives, even if they are real.
The Buck knife looks like a model 776 Revel Safe Spin (another very inexpensive knife, they sold for $20 new), but Buck knives are also counterfeited. Either way, it might not be worth selling.
The Gerber looks like the Chameleon model.
There are a few fixed-blades among those knives that I don't recognize. But as far as the folders, and some of the fixed-blades, I'd be surprised if you found any buyers here at Bladeforums. The members here lean towards higher-end knives, and they most certainly won't buy counterfeits.
The knives that are clearly marked with brand names, model numbers, etc, you can research online. You might find buyers on ebay, as ebay is a place where people buy cheaper knives.
Sorry to be the bearer of bad news.