Yes, you can use condensed milk. I'm not sure what the ratio of water to milk is. Kittens always play rough. As long as there is no blood being shed, I wouldn't worry about the male attacking the female. Just make sure you have them fixed before they are 6 months old.

When you say the vet says they're too young to have their nails clipped, did he mean DECLAWED??? If he meant the "D" word, please, I beg you to read this and reconsider having that barbaric procedure done to these precious babies. It's not just clipping the nail, the procedure is actually cutting off the nail at the first knuckle (knuckle, tendon, nerves and all). It is very painful, and they can develop problems later on down the road such as arthritis, litterbox and behavioral problems.

http://www.oaklandspca.org/cats/declawing.html

http://www.catscratching.com/

Also, did the vet say anything about the white kitten being deaf?? It is fairly common for white cats with blue eyes to be deaf. If he IS deaf, this kitten, for his own safety, MUST be kept indoors! I cannot emphasize it enough, because he will have no way to protecting himself should some other creature sneak up on him (coyote, fox, dog, etc.)

The milk formula you came up with should work. A month old is only 4 weeks, which means they should still be on formula. You can give them canned kitten food mixed with the milk formula. Put a newspaper underneath a saucer of it and let them go to town. It's messy but that's how they learn. Make sure they always have fresh water and dry kitten food at all times. Cats are snackers. Unlike dogs, where they eat till they puke, cats will snack all day on dry food.

As far as peeing and litterbox habits, they're a little young but get a small litterbox with CLAY litter to start with. Confine the little ones to a small room with their food, water and litterbox in it. They should get the idea. You can still scoop clay litter, but you'll have to change it alot more often than scoopable because of the urine odor.

The reason for the clay litter is because cats are very clean animals and when grooming themselves after a visit to the litterbox, will lick the litter off their paws and ingest it. If it's clay litter, it won't hurt them. But the clumping stuff, if swallowed, will become a hard mass and can cause alot of problems. Here's another link to explain it.

http://www.catmom.com/marina/articles/clump.html

Good luck Mommy!! You have two beautiful Persians there! One more thing....Please have your babies spayed and neutered the minute they are old enough.