Originally posted by Akash005
That wasn't the intended question though, in ur terms, the original question could b rephrased to 'how long or how many generations does it take for a muggle born magical couple to create a pure blood family tree?'.. to which there is no definite answer..
A muggle born magical couple cannot possibly make a pure blood family tree. That is, quite frankly, IMPOSSIBLE. The whole point of pure blood families is that each and every member of the fsmily since Adam and Eve is from pure blooded wizarding family. This discussion that you have started is a very lengthy matter which has probably been discussed in the magical year for ages.
Also, I would recommend a change of the topic. 'FRUSTRATION WITH DUMBLEDORE' doesn't exactly sum up our discussion. Might want to change it to 'Questions' or 'Matters of Discussion' etc. but please change the name.