A brother-in-law is read as a sibling bond you did not grow up with. Dream books link him to rivalry, friendship or the adjustments that come with a family expanding.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.