So, is inbreeding a problem?

Maybe I'm wrong in my assumption, but as I have researched (the little bit that I have) ...if I bred a het X to a normal, and then breed the offspring back to the het, is that a problem? Or do the offspring then need to be bred into a different "family"?

And, please explain the 1.0 normal, 0.1 etc... stuff. Haven't found that here, yet.

BTW, I have my friend's normal female BP (named her Gertrude, call her perdy gerdy cause she's so pretty). She's only 28" long, but is about 6 years old. His other friend had her and fed her very little...a medium rat every other month. My friend can't have it at his house because his wife has nightmares about it--basically can't handle it.

Anyway, I got it to my house last week. BPs are SOOOOO beautiful! I love that she'll just hang out with us. So docile, nice.