Yes, shotgun, it is amazing how they hid that about Rutherford. They lived separately for many years. Strangely, though when he was living in California where she lived, they still lived separately. I don't think his son Malcolm became a JW. Malcolm died in 1989 and I think has a son named Paul who is still living. I'm sure the Internet forced the WTS to reveal this information.
Proclaimers Book (1993) p. 89
Brother Rutherford was survived by his wife, Mary, and their son, Malcolm. Because Sister Rutherford had poor health and found the winters in New York (where the Watch Tower Society’s headquarters were located) difficult to endure, she and Malcolm had been residing in southern California, where the climate was better for her health. Sister Rutherford died December 17, 1962, at the age of 93. Notice of her death, appearing in the Monrovia, California, Daily News-Post, stated: "Until poor health confined her to her home, she took an active part in the ministerial work of Jehovah’s Witnesses."