Families of the Universe

Mr. Biz and Buck steals Phineas and Ferb old Dimension Traveling Machine (from Across the Second Dimension), in an attempt to erase the Flynn-Flecther family from exhistance. Phineas, Ferb and their families travel across different dimensions and team-up with alternate versions of themselves. (Resembling characters of many family sitcoms)

Families
The Flynnsters (The Munsters)

The Flynninghams (Happy Days)