Why was Rasputin allowed into the Romanov's royal court? Why did the Romanov family keep the reason for Rasputin's presence a secret?

Grigory Yefimovich Rasputin is a magnetic specter in the drama that is Russian history, for the peasant mystic from Pokrovskoe played a defining role in the last days of the Romanov Dynasty. In 1905, the fateful meeting took place. Rasputin requested—and was granted— an audience with the Romanov family at Peterhof, where he presented them with a hand-painted wooden icon of Saint Simeon, a venerated Siberian saint dear to Rasputin’s own heart. He soon became a trusted advisor and confidante to Emperor Nicholas II and Tsaritsa Alexandra Feodorovna; Alexandra in particular was convinced that the “staretz” was a gift to her from God Almighty, sent to ease her passage through life as the “Little Mother of Russia,” and especially to preserve the precious life of her only son, the Heir, Tsesarevich Alexei Nikolaevich.