To dream that you someone (your mother in this case) is morphing into an animal suggests that she needs to express herself more freely and without restraint. You may be hindering her from doing so, since it is she that is morphing into the cat, and not you.
It is not clear whether the missing cat has been found in real life or not. If not, then the dream suggests that you might find the cat in a location associated with your late mother-in-law.
What does it mean to dream a panther cat come to your door and sit outside
The mother cat represents yourself, while the single kitten represents something that is important to you. This might be an assignment or project, or an important relationship that you are committed to developing.
== == Look, dreams happen. But I think it means you'll have a bad thing happen to you, but later it turns out to be a victory.-Wolfluver
it means to get drunk
Bad Luck
it usually means that the cat is frightened, or upset
It means that you have dreamed of cat hair on stockings. Dream interpretation is personal; what matters, what is important, is what the imagery means to you.
If you mean what is a mother cat called the answer is a Queen
she the cat's mother is what you say if someone is calling somebody else she instead of their given name.
that you are a cat person
Tom and jerry.