The Rabbis Sons... wow! such a great group.. they broke up in the 70s, and only got back together occasionally after that.
This partial reunion is at the wedding of a Dani Weinberger, I would guess he is the son of Itzy Weinberger, the vocalist of the group.
The original group consisted of Rabbis Baruch Chait, Itzy Weinberger, Michael Zheutlin, and Label Sharfman...