2 sentences

1. 受害者有个孪生兄弟。

   shòu​hài​zhě yǒu gè luán​shēng xiōng​dì.

   The victim has a twin brother.

   Source: OpenSubtitles

2. 他们是一对孪生兄弟。

   tā​men shì yī duì luán​shēng xiōng​dì.

   They are a pair of twin brothers.

   Source: Dong Chinese Dictionary