Alfonso Soriano was born on January 7, 1976.
No, the sentence is not grammatically correct. It should be: "Is it Alfonso's grandmother's birthday?"
Alfonso Arau was born on January 11, 1932.
Kristian Alfonso was born on September 5, 1963.
Alfonso Cuarón was born on November 28, 1961.
Alfonso Herrera was born on August 28, 1983.
Alfonso Salmeron was born on September 8, 1515.
Alfonso Ribeiro was born on September 21, 1971.
Alfonso Leng was born on February 11, 1894.
Alfonso Ferrabosco I was born on January 18, 1543.
Alfonso López Michelsen was born on June 30, 1913.
Giovanni Alfonso Borelli was born on January 28, 1608.
Alfonso XIII of Spain was born on May 17, 1886.