This is rather an easy question, but left me stuck with it.
Situation: I'm writing a composition about the reading we studied in our book (as a summary). It's about an illiterate senior citizen who ran into trouble when his literate wife went on a trip. He went hungry, so left home to go shopping to buy goods to make himself some dinner.
Dilemma: One of my friends used the statement in the title in his summary. Note that the use of "our" is to give the story a childish sense, and there's no problem with that. However, I argued that it's feasible for the statement above to give the implication that "the old man is buying us and himself dinner"; which will accordingly count as ambiguity and lessen the quality of the sentence. Am I correct? If not, please provide a thorough explanation of why such interpretation of sentence isn't happening.
(Since we're learners, ambiguity isn't called "the beauty of language" for us!)