Suggestions???

Ok well my sister-in -law lives in Puerto Rico I've never met her in person only thru video chat so ever since my daughter was born she has wanted to come so she finally has the opportunity to come but wants to make it a surprise for her brother they haven't seen each other in years so I can keep a secret but how can I make it a surprise to pick her up in the airport if my boyfriend is the one driving to the airport so how can I make it a surprise for him

Hope you understand what I wrote lol