How to get name of brother deb packages which build from a source package

[Eric Zhong]

Somebody give me some debs, I want to auto-check if lost some debs which
build from same source package.

Example:

I have souce package:
    gcc-defaults_1.124ubuntu6.dsc
    gcc-defaults_1.124ubuntu6.tar.gz

and debs build from it:
    g++_4%3a4.8.2-1ubuntu6_amd64.deb
    gcc_4%3a4.8.2-1ubuntu6_amd64.deb
    gcc-doc_4%3a4.8.2-1ubuntu6_amd64.deb
    gccgo_4%3a4.9-1ubuntu6_amd64.deb
    ...

but I have not:
    gobjc_4%3a4.8.2-1ubuntu6_amd64.deb

How to check ? Are there some commands deal with it easy ?