Their mother.
It would have to mate with another cat.
A black cat would be more unlucky than a white cat. An example of this would be the belief that a black cat crossing your path leads to bad luck. There is no bad luck that a white cat would give you.
The cat has the biggest amount of babies at once.
If you encountered a black cat with blue skin, it would likely be a rare and unusual sight. The blue skin could be due to a genetic mutation or a dye, but it would not change the fact that the cat is still a black cat. It would not have any supernatural or magical significance, despite common superstitions about black cats.
Yes, a cat can have anwhere from 1 to 6+ babies at a time
no one. she would make it a pet/minion
If a black cat walks towards you, it brings good fortune, but if it walks away, it takes the good luck with it. Keep cats away from babies because they "suck the breath" of the child. A cat onboard a ship is considered to bring luck. These Superstitions? How is this an answer?
There is no such thing as a "purebred" white cat. White and black are just colours, not breeds. For a start, there are two genes that can make a cat white: The usual being dominant and therefore cannot be carried by a black cat, and the recessive albino. My guess is we are only talking about the recessive allele, so we have a black cat carrying albino (Cc) and a pure albino (cc). In this case half the kittens would be white (cc) and half would be black (Cc). Forgetting the albino gene, the black cat would not be carrying white at all (ww), the pure white cat would be dominant (WW), and all the offspring would be white (Ww). In life I would say the purewhite cat is most likely dominant and if the black cat carries the albino allele or not it makes no difference; all offspring would be white.
black white or grey
it would be a black or yellow cat. possibly it could be be mixed colors but not very common
There is no such thing as a "purebred white cat" or a "purebred black cat." "Black" and "white" are just coat colors, like "tabby" or "calico." They are not breeds or species. A black coat, a white coat, a tabby coat, a calico coat -- all of these are just some of the most common coat colors/patterns of several domestic breeds, like the American shorthair and British shorthair. A white cat and a black cat could have babies of any color, depending on what genes they are carrying. Just like with humans, the fact that you or your spouse have brown/blonde/red hair does not by any means guarantee that your children will have brown/blonde/red hair. Predicting genetic patterns is an extremely complicated business, not least because a lot of it comes down to pure chance.
Depends if you believe in the myth of the black cat, but i would say no that would still make it bad luck if i believed in that.