In Lubavitch they tell the story of a Yid who asked the Rebbe’s advice whether his son should travel to America. The Rebbe did not approve. The son nevertheless set out on the trip and drowned tragically, may G-d spare us. The father came to Lubavitch for yechidus and asked, “Rebbe, why didn’t you tell me?! I wouldn’t have let him travel. ”
The Rebbe’s countenance changed. “Believe me, ” he said, “I didn’t know. But when we give advice, it should be followed. ”
after the Rebbe Rashab's passing, and it was said that the Rebbe took him into his abode in Gan Eden.