And that's exactly what has just happened between Pretty Little Liars on-screen siblings Lucy Hale (Aria Montgomery) and Cody Christian (Mike Montgomery).
Right now, Cody is starring on The CW's new show All-American.
Of course, Lucy is super proud of him and congratulated him online for all the fans to see.
"Yes ! Congrats Cody!" she wrote.
Cody quickly responded, "Thank you!! Love you so much wish I had an older sister on this show."