Ivan, the gray cat, in the top photo, is a Russian Blue.
His brother Yuri is in the second photo.
The brown cat, Razputin, is a Siamese mix, who is all brown except for 2 whites toes on each front paw. His litter mate was a chocolate point meezer. It's almost like Razpy is a meezer-in-reverse. Here is a baby picture of him and his brother (who was adopted by someone else.)
Razpy looks more like a havana brown to me then anything else.He even has brown whiskers, which are only seen in the havana breed.