Yí ge yǔxì xiàmian wǎngwǎng fēnchéng hǎojǐ ge yǔzú.
A language family is often divided into several language groups.
Tips
usage
The ranks run 语系 (family) > 语族 (group) > 语支 (branch) > 语言 (language). English, for example, is in the Germanic group (日耳曼语族) of the Indo-European family.