Most everyone has heard of the Sullivans - the five brothers who enlisted together, were assigned to the same ship, and all died when it was torpedoed.
Today I came across an AP article in Jan 1941 about the enlistment of the seventh Patten brother. After basic training he was going to join his brothers on the USS Nevada.
Turns out eight total sons served in the US Navy, and their father joined up after Pearl Harbor. Six of the sons were on the Nevada at Pearl Harbor; all survived.
https://sites.rootsweb.com/~iaohms/military/patten_brothers.html
http://www.pearlharborsurvivorsonline.org/html/USS20Nevada20Patten20Brothers.htm