I can certainly relate! I have two feline furbabies, one of whom really likes to follow me into the sewing studio. She looks like your white one but she's all black. The other one, her sister, is a tabby. Honestly they came from the same litter, but we think they had different Dads. A friend of mine took in the Mom when she was a stray and she had 6 kittens - three black long hair, and three short haired tabby. Not only do they look totally different, but they have independent personalities. The black one, Molly, is all fluff and weighs 5.7 lbs. Sally, the tabby, is a chunk and weighs 13 lbs. Gotta love 'em!
We used to have a Maine coon who weighed 22 lbs. He was a real character, too.