Маленькая дочь целует папу в щёку и смеётся.

and

Breakdown of Маленькая дочь целует папу в щёку и смеётся.

• смеяться: to laugh
• в: on
• папа: the dad

Questions & Answers about Маленькая дочь целует папу в щёку и смеётся.

How do we know that дочь is the subject and папу and щёку are objects?

In Russian, the subject is normally in the nominative case, and objects are usually in the accusative case.

• дочь is in the nominative (dictionary form is also дочь), so it’s the subject: the daughter is doing the actions.
• папу is the accusative form of папа → he is the person being kissed (direct object of целует).
• щёку is the accusative form of щёка → it’s the part of the body being kissed, after the preposition в.

So grammatically:
Маленькая дочь (nom.) целует кого? папу (acc.) в что? щёку (acc.) и смеётся.

Why is it папу and not папа?