Given the question: Information:  - Mexico (, modern Nahuatl ), officially the United Mexican States, is a federal republic in the southern half of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Covering almost two million square kilometers (over 760,000 sq mi), Mexico is the sixth largest country in the Americas by total area and the 13th largest independent nation in the world. With an estimated population of over 120 million, it is the eleventh most populous country and the most populous Spanish-speaking country in the world while being the second most populous country in Latin America. Mexico is a federation comprising 31 states and a federal district that is also its capital and most populous city. Other metropolises include Guadalajara, Monterrey, Puebla, Toluca, Tijuana and León.  - Nayarit, officially the Free and Sovereign State of Nayarit, is one of the 31 states which, with the Federal District, make up the 32 federal entities of Mexico. It is divided in 20 municipalities and its capital city is Tepic.  - Compostela is the name of both a municipality and the town within that municipality that serves as the seat . They are in the Mexican state of Nayarit . The population of the municipality was 62,925 ( 2005 census ) in a total area of 1,848 km² ( 713.5 sq mi ) . The population of the town and municipal seat , was 15,991 in 2000 .  - Tepic is the capital and largest city of the Mexican state of Nayarit.    What is the relationship between 'compostela' and 'tepic'?
The answer is:
sister city