Kolik je ti let a kolik je tvojí sestře?

How old are you and how old is your sister?

Breakdown of Kolik je ti let a kolik je tvojí sestře?

• být: to be
• tvůj: your
• a: and
• rok: the year

Questions & Answers about Kolik je ti let a kolik je tvojí sestře?

What is the literal, word‑for‑word meaning of Kolik je ti let a kolik je tvojí sestře?

Literally, it breaks down as:

• Kolik – how many / how much
• je – is
• ti – to you (dative of ty)
• let – of years (genitive plural of rok – year; the irregular plural form let)

So Kolik je ti let = How many years is to you? → idiomatically: How old are you?

Second part:

• a – and
• kolik – how many / how much
• je – is
• tvojí – your (feminine, dative; agreeing with sestře)
• sestře – to (your) sister (dative of sestra – sister)

So kolik je tvojí sestře? = How many (years) is to your sister? → How old is your sister?
The word let is simply omitted in the second clause because it’s clear from context (see another question below).

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Why is ti used here, and what case is it?