هٰذَا ابْنُ اللِّصِّ
This is the thief’s son.
أَخُو اللِّصِّ عِنْدَ عَمْرٍو
The thief’s brother is with Amr.
Annexation can also disparage the annexed person, especially when the relationship invoked is presented as discreditable in context. It is not intrinsically a device for honor.
A concise idafa can also suit a constrained speaking situation—for example haste, distress, or limited time—because it identifies a person without a longer description.