In the new video, the six Lair brothers welcome home their newborn baby sister, Ruby Jane.
And each brother's reaction to Ruby is more adorable than the last!
Take Sawyer, 7, who swears to take down anyone who hurts his little sister.
Campbell, 10, says Ruby's future boyfriends will have to seek his approval before dating her.
Even 2-year-old Knox had something to say.
BuzzFeed has reached out to the Lairs for comment. You can read more about the family here.