I'd like to define some things in this thread.
Most of you stock guys and I'm sure alot of dog guys already know....
First cousins and farther removed (I.e. second third and so fourth) is line breeding.
Mother/son , father/daughter, also defined as line breeding. And a widely recognized tool utilized in domestic stock and performance bred animals.of course this all gets tighter as the line goes on.
Full brother/full sister is inbreeding. This is were things get risky. Full brother/full sister out if full brother/full sister is even more so and so on
All this is measured in coi % bit the animals tell you the story not the chart.
I guess that all depends on who you talk to. Some breeders consider inbreeding any immediate family member so that would include your mother x son crosses and your father x daughter crosses as well. Scientifically speaking linebreeding is inbreeding, but most people classify close inbreeding as inbreeding and loose inbreeding as line breeding. So its just opinion anyways. But I have heard it the way you state it as well. Two different ways to classify it, just thought I would bring that up since this has been a good thread with tons of info and different ideas.