Hi. welcome to TCS and thanks for sharing pics of your cute cats!
Cats are not like dogs that are usually a specific breed or mix of breeds. There has been much less human control of breeding of cats than dogs. The vast majority of cats have bred randomly on their own and have a mix of genes from the general random-bred cat population in their part of the world , and most of those aren't really classified as "breeds" and usually if they did have a bit of some breed in them it's not possible to tell. It can be fun seeing if they might look a bit like some pedigreed breed. but a lot of cats really just look like their own unique selves.
These cats come in many shapes, sizes, fur lengths and colors . are just called Domestic Shorthair or Domestic Longhair which just means no particular breed or unknown ancestry. or are affectionately called " moggies" .
These are sweet pictures but not really the best for looking closely at things like body type and head shape. and color is not the same as breed. so one can't tell by color.
So basically these kitties would be Black and White DSH , Brown Tabby DSH , and Black DLH.
( There are different kinds of tabby patterns, but I can't tell what kind of tabby pattern Little Man has in that adorable picture of him stretching on his back , because spots on the tummy are pretty normal in various kinds of tabby patterns . You have to look at the sides of the cat to see the tabby pattern. For example the ones with rather narrow vertical stripes on the sides are mackerel tabbies.)
There are different genes that can cause a bobtail , it's something that has turned up in different cat populations around the world. or it can also be something that wasn't a genetic cause but happened in development of the fetus.