Oh, Hitman, research this, man! What an interesting bit of family history if it is true. There should be records available as to the crew of the Californian.
The Titanic used both the CQD and SOS distress calls. The first time that a ship used the SOS call for help was in 1909 off of Cape Hatteras, when the SS Arapahoe used it, the call being picked up by the Hatteras station.
Here's a link to some info about SOS:
SOS