T.C.
You can google family tree's. There are a few websites that offer a free one you can just add too.
I bought my software from Office Depot. Cheap version, but its really neat. It costs me $20 for one, then got a differnt "game, etc" for free. So it didnt cost me much.
The software allows me to change sex's (for those with same sex rela.) birthdates, birth cities, death's, locations, anniversary, and even current addresses.
You can also try ancestry.com
Good Luck!