Final answer:
The Romance subfamily of the Indo-European language family includes French, Italian, Spanish, Portuguese, Romanian, and Catalan, among others.
Step-by-step explanation:
The Romance subfamily of the Indo-European language family includes French, Italian, Spanish, Portuguese, Romanian, and Catalan, among others. These languages evolved from a common ancestor known as Vulgar Latin, spoken by the common people during the Roman Empire. Each language in the Romance subfamily features hundreds of millions of speakers worldwide.