Can domestic cats and bob cats interbreed?

One of my cats is a bit unusual compared to the others. He is a black Manx cat, and only has a stub for a tail. He is only just over a year old, and Manx cats don't reach full maturity until they are about 5 years old. Compared to his brother, also a black Manx, he is quite a lot bigger - half again as big - and he has tufts of fur on the top edges of his ears. There are no domestic cats that I know of that have the tufts, except Savannah cats, and it is very unlikely that he is the offspring of a Savannah cat. (they're kinda rare) I do live in a somewhat rural area and there are bob cats around here, so I'm wondering if my strange cat may be part bob cat...is this possible?