Learn Italian: La nonna vi bacia sempre. - Grandma always kisses you all.

In Italian, short object pronouns like vi usually go immediately before the conjugated verb. So instead of saying Grandma kisses you all in that order, Italian phrasing is Grandma you all kisses (La nonna vi bacia).

Who exactly is vi referring to in this sentence?

vi is the direct object pronoun for the plural you. If the grandma were only kissing one person, the sentence would use ti instead: La nonna ti bacia sempre.

Why do we say La nonna instead of just Nonna?

In Italian, you almost always need a definite article like La before a noun, even for family members when talking about them like this. The main exception is when you use a possessive word with a singular family member, like mia nonna (my grandma), which drops the article.

Why is sempre at the end of the sentence?

In English, we usually put always before the verb. In Italian, adverbs of frequency like sempre normally go right after the verb they modify. Since the pronoun and verb (vi bacia) stick together as a unit, sempre goes after both of them.