Earth and Mars, are the only places in our Solar System that would be able to support any organic versions of life. We are positioned at the correct distance from the sun to where we don't burn up and we don't freeze over which is why this zone is aptly named "The GoldiLocks Zone".
Earth is the most likely place to contain life, it does.
As far as planets go, it's really unlikely that any of them could support life. There are still plenty of moons that may at least be capable of supporting life similar to what we see, such as Europa or Titan.
Europa orbits Jupiter and is coated all over with ice. There is a possibility that underneath is a liquid water ocean, which could support some form of life.
Personally, I don't think anyone will find other life within this solar system, but it would be laughable to think that Earth is the only place in the entire universe with life. Living things can exist- and thrive- in lots of extreme environments, including lightless, boiling hot water miles below the ocean's surface. Tardigrades, a simple microanimal, can survive without water for decades, although they become dormant.
MARS! I think that has been established.
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