Line breeding ?

I've got some other dogs from some buddies that are workin out hoping to mix in the future , I don't like buying someone else's dog to many variables I how it's gonna work for me . Both the mother n son are one in the same dog which I greatly like ,the sire is cat with 1/4 ab and he's find and catch , the 2 I wanna breed are find and bay the pants off that's what I'm trying to accomplish in breeding these two , I've gotten really bored to the point the sire is kinda being used as a walk in catch dog because I wanna get in and watch my dogs workin te hog then get there and him hanging from it. This the reason for wanting to try this breeding. They gyp is yella cur dog , sire is the cat 1/4 ab and the son I'm wanting to breed is a obviously mix of the 2 . And what I was hoping to get at is there won't be so much roughness in them . So if I don't decide to do it another possibility would be to see if a lead dog of one my buddy's has the same traits as my gyp breed them to and breed those pups back into my dogs down rd . I dunno just a lot to think about