Brigham Young secretly ordains his eleven-year-old son John W. an apostìe in connection with receiving the endowment. He also ordains his eighteen-year-old son Brigham Jr. as apostle, either this day or (more likely) at his namesake's endowment a few days earlier. The Twelve doesn't learn of these ordinations for almost nine years. In later years he secretly ordains two other sons as apostles.
[Wilford Woodruff related, "President Young said, 'I am going to tell you something that I have never before mentioned to any other person. I have ordained my sons, Joseph A., Brigham & John W., Apostles and My Counsellors. Have you any objections?' J. Taylor and G. A. Smith said they had not, that it was his own affair & they considered it under his own direction. He further stated, 'In ordaining my sons I have done no more than I am perfectly willing that you should do with yours. And I am determined to put my sons into active service in the Spiritual Affairs of the Kingdom and keep them there just as long as possible. You have the same privilege.'"]
[The Mormon Hierarchy - Extensions of Power by D. Michael Quinn, [New Mormon History database (http://bit.ly/NMHdatabase)]]