Questions & Answers about Vaše rodina je velká.
Vaše can mean either:
- your when speaking to more than one person
- your when speaking to one person formally
So this sentence could be addressed either to a group or to one person in a polite/formal way.
Also, vaše changes form to match the noun it belongs to. Here it goes with rodina, which is feminine singular, so vaše is in the form that fits that noun.
In Czech, every noun has a grammatical gender: masculine, feminine, or neuter.
Rodina is a feminine noun. One common clue is that many feminine nouns end in -a, and rodina does.
This matters because other words connected to it, like adjectives and possessives, usually have to match its gender, number, and case.