Recently, the Hubble telescope has found more than a dozen planets around nearby stars. Most are closer to their star than Jupiter. These results confirm our expectation that most stars have planets. The fact that they are all large and close to their stars is an artifact of the way we found them. Thus, large planets near a star are easier to detect because they produce more wobble.
Many stars are in multiple systems of two or more stars.
The triple of Alpha Centauri, Beta Centauri and Proxima Centauri shows that having multiple stars does not rule out the presence of suitable planets. In this case, an Earthlike planet could orbit any of the three stars and still remain far enough from the other two to have a stable orbit. It therefore seems extremely likely that we will find planets, which are the size of Earth and have oceans and moderate atmospheres.