I am trying to make the /blockdata command work on blocks within a radius of a mob. Basically, I am trying to make all signs around a zombie named "Empty_Child" change to say:
Mummy? Are you my mummy?
This is the command I am using so far, but it only works on the block the zombie is standing on: /execute @e[name=Empty_Child] ~ ~ ~ /blockdata ~ ~ ~ {Text1:"{\"text\":\"Mummy?\"}",Text2:"{\"text\":\"Are you my\"}",Text3:"{\"text\":\"mummy?\"}"}