That depends, if you mean the pre-Flashpoint Captain Marvel, Mary Marvel and CM3, then no, they should be equal in power as a group, but the Marvels would be individually more powerful than the Shazams due to power sharing (the Shazams are splitting the power into six, the old Marvels only into 3 as Pedro, Eugene and Darla were only introduced in Flashpoint). Currently, only Billy and Mary have their powers, so unless they give the other four their powers back they'd be stronger than their pre-Flashpoint counterparts.
If you mean Marvel's Marvel Family, then the answer is probably no, we know Carol is specifically weak to magic, so the Shazams would probably beat all of them except Monica (she and Kamala have different powers, and thus different weaknesses - Ms. Marvel would still be outclassed though as her powers are street level).