There was some other guy there, who was as involved in the rescue as GZ, or possibly more.
AFAIK, his name has not been reported, and nobody is going to hold a press conference to publicly thank him.
Is there any particularly logical reason this family should be giving more publicity to GZ simply because he was recently acquitted in a high-profile trial?
Uhm, yes...
Zimmerman _needs_ their support. Zimmerman’s own life is n danger, and their speaking out on his behalf might actually make a difference to his survival or how his life will be from now on.
They owe him their lives and should do what they can to help him. It’s about honour and decency, things that would have been a matter of course not long ago...