Originally Posted by dkc192

The domestic exit from TBIT airside is next to the security checkpoint. You could meet your relatives near the bottom of the left (south) side escalator from the check-in hall up to security. There are airport employees checking BPs at the bottom of the escalator who will not let you up without a BP, so you can't meet them right at the exit from the secure area, but the bottom of the escalator should be close enough.