Interviewing for new job but have a week long trip I need to take in august

So I have a interview today for a new job but I have a week long trip in august that I have to take as it’s a family related issue. Should I bring it up? Should I wait until the second interview or if they give me an offer (assuming I nail this). I don’t want to bring it up upfront and mess up my chances but I also don’t want to mess up down the line by not telling them sooner