Q: "A kid in an ocean rides a wave." Does this mean that "A kid rides a wave."?
A: yes

Q: "Two children with blond-hair are playing on a blue slide." Does this mean that "A boy and a girl are playing on a slide."?
A: it is not possible to tell

Q: "One girl is hugging another girl in front of an American flag." Does this mean that "Two best friends are hugging."?
A: it is not possible to tell

Q: "A couple walks down the sidewalk." Does this mean that "A man and woman are walking down the sidewalk."?
A:
it is not possible to tell