If you look up the word you selected and the meaning turns out to be quite different from what you intended, look up similar-sounding words until you find the one you wanted. You may be surprised how many words are commonly used incorrectly or mistaken for each other in speech. Identifying Your Pronouns Fred went to his brother's house to get his hat. All we know is that it belongs to someone male. Sometimes it feels awkward to identify a pronoun.
Readers are like that.
This is still mildly ambiguous, but will be understood in context. The probability that it is Fred's hat is increased. Or if the hat belongs to the brother, you could say, Fred went to his brother's house to borrow a hat for the party. It could be that Fred's brother keeps a houseful of hats belonging to persons we have not met, but very likely he does not, and the hat in question actually belongs to him. This sort of thing is important to the reader.