The Nussbaum Brothers

Peter and Alfred Nussbaum were tailors and partners in the firm Nussbaum Brothers. After many years they decided to Anglicize their names and henceforth the firm should be known as the Nuss Brothers.
After completing the legal paperwork, they informed the receptionist, Ethel, that from Monday on she should answer the phone as "Nuss Brothers."
"I quit," said Ethel.
"But why?", asked Peter, "the pay and benefits will be the same!"
"Yeah? Well, YOU answer the phone then. I don't want to answer and find that the caller says he wants to speak with Mr. Nuss.
Then I have to say..... "Yes Sir; which one? P-Nuss or A-Nuss?"