The top gun appears to be a Rifled Musket from before the Civil War or during that unpleasantness.
It looks a bit like the Springfield 1842 I used to own but without a more detailed inspection it's hard to say. It could be a later model that was made in the 1862-1865 time frame.
We have several very knowledgeable members that will be able to give you a better idea about it.
The double barrel shotgun could have been made any time between 1830 and 1870. (After around 1870 cartridge guns became popular.)
As for the "Enfield", it was most likely made between 1853 and 1865.
If you want to shoot any of them, please have it thoroughly inspected by a good gun smith.
You might also want to check them all to see if they are still loaded.
Often, these old guns were loaded and sit aside and they are still loaded today.
A quick way to check to see if they are loaded is to run the ramrod down the barrel.
It should go to within an inch of the breech end of the barrel. If it doesn't go that far down the barrel be very cautious.
Although it could be nothing more than a couple of marbles or wads of paper some kid stuck in it, it could be a fully loaded charge and since black powder doesn't weaken with age it could fire.