though i agree with the first response, i'll try to explain.
just because you're a 10 generation witch [random example] doesn't mean you are more powerful than a first generation witch. magic [or magick] is energy, to be powerful at it, is to practice. some people are better at it than others, though it has nothing to do with what family they belong to, just how long they've been working at it. i was born with psychic powers, most woman on my dad's side are, but i still need to work at or or they grow weak and i can't use them as well. some people are better at certain things, breeding has nothing to do with magic, understand?