I know if I was talking about all the members of the Smith family I would say Smiths, and I could say Vogels for all the people in the Vogel family. But somehow "all the Perrys" is wrong - it just doesn't work for the people in the Perry family. It can't be Perry's because that would be possessive. So - how would you write that for those families that end in a vowel?
The Smiths are taking off soon.
The Vogels are taking off soon.
The Perrys are taking off soon. - doesn't work Why?
The Sathres are taking off soon. - doesn't work Why??
The Smiths are taking off soon.
The Vogels are taking off soon.
The Perrys are taking off soon. - doesn't work Why?
The Sathres are taking off soon. - doesn't work Why??