I am looking for a tour group which has tours which specialize in visiting US presidents homes and libraries. I know that some presidents don't have presidents libraries but all presidents have sites relating to being president. If you can help me with this and let me know I really would appreciate it.

The Presidential libraries are usually in or near the hometown of the presidents. So, are you looking for a tour that goes to Georgia, Arkansas, Texas and California? If so, I don't know of one. Perhaps if you have the time and money you could hire a private driver for about a month or so.

Presidential libraries and sites are spread out over much of the county and there is no tour that will take you to all of them.

My parents made visiting these libraries and sites a theme for their retirement and they ended up visiting places for about 20 presidents - over 11 years and driving all over the country.

Suggest you either lay out a very extensive tour and rent a car - or pick a couple of key places that might be doable by tours - not one but multiple tours from nearby cities.

Such as Mount Vernon and Monticello from DC or Kennedy in Boston.

Tagging this for DC is pretty useless really. Except for a few places like Mt Vernon and presidential-related sites IN the city like Ford's Theater etc -- what you are looking for are spread all over the country and as posted above would take ages to visit all or most of them.

Rather than look for some far ranging/all encompassing tour (likely doesn't exist) decide which libraries and birthplaces you want to see most, then plan a trip to say Southern California (for Nixon and Reagan) or Texas (for LBJ and Bush 43) or Missouri (Truman) or which ever presidents you most want to see . . .

Here's the place to start:
http://www.nps.gov/nr/travel/preside..._of_sites.html

Decide which (1) presidents you're interested in or (2) states you're willing to visit. Then decide if you're willing to spend the time & money you'd need to visit these sites.

If you're based in Washington DC, then you could rent a car and visit six presidential homes. With a large amount of time, money, and effort; you could visit about a dozen more sites on the east coast.