...cant think a valid reason for offering 3 flavors
All depends how they're written. If all three are written as polymorphic layout and command handling variations around a unified framework, a single app could make sense.
If however they started as one app for one brand, later deciding to support other brands, it's entirely plausible it was easier to write a new app each time than refactor into an extensible framework.
Without knowing the app architecture and decisions behind it, it's impossible to make an informed comment. With 3 staff we're clearly talking a very small business, possibly part time, who may not feel the need or have the time for architecturally elegant solutions.