import random
import sqlite3

random.seed()
brothers = ["Guillaume", "Geoffroy", "Thibaut", "Bertrand", "Enguerrand"]
random.shuffle(brothers)
conn = sqlite3.connect('famille.db')
c = conn.cursor()
for i in range(5):
    c.execute('UPDATE users SET kado=? WHERE user_name=?',
              (brothers[i], brothers[(i + 1) % 5]))
conn.commit()
conn.close()