We just used their names a lot - especially in combo with food. So I guess it was Jenny's suggestion to use it in association with things they love.
"Lazlo, here's your dinner!" "Lazlo - treats!"
She'll learn her name, don't worry. Whether she'll respond to it is a completely different thing, however.
Cats are not an animal pre-programmed to respond to their names.
We've got lots of "cat saying" signs around and about. Some are good lessons about the nature of cats and dogs.
Dogs come when called - cats take a message and get back to you.
Dogs have owners - cats have staff.
Dogs are man's best friend - cats may be our best friends, but would never stoop to admitting it. ...OR Dogs are man's best friend - a cat is a cats' best friends.
If a dog jumps in your lap, it is because he is fond of you. If a cat jumps in your lap, it's because it is warmer.
Regarding your brother.... does your cat free feed on dry food? If that's the case... does your cat get any meals of wet food? If so, have your brother feed the cat the wet food meal(s). Cats like the people who feed them.