The gang, who targeted the homes in the Glengad area of Malin, stole a considerable amount of jewelry and other items in the two raids on Friday evening last.
The houses raided included the mother of the groom and also his brother.
Local county councillor Martin McDermott, who is a relation of the victims, said people were outraged by what had happened.
He said much of the items taken were of great sentimental value to the families.
“We are appealing to anybody who knows any information to come forward. These items were of great sentimental value as the family ost their father in a tragedy some years ago,” h said.
He also appealed to anybody who may have witnessed anybody watching the Ballyliffin Hotel where the wedding reception was being held to contact them.
“We feel this gang could also have been watching the hotel in case anybody left it to return to the homes.
“If anybody noticed anybody acting suspiciously around the hotel to contact the Gardai also,” he said.