> Was Gale Garnett (of the hit "We'll Sing in the Sunshine") an announcer for either station, using the name "Mother"?

Gale Garnett was "Mother," the voice of San Francisco's progressive rock KOIT (93.3 FM, not related to the current Lite Rock KOIT). "Mother" did the pre-recorded voicers heard between songs and commercials on the station.

> My brother-in-law, who was host of radio show in the Bay Area in the 6o's, Alan or Allan Pierce, the show was called Ten Ton mustard seed i think or ten pound mustard seed?

That would be "The Ever Changing Transcendental Multilingual Two-Ton Mustard Seed," produced by Allan Pierce at KFAX and heard also on KFRC in San Francisco from around 1966 to 1968:

http://www.bayarearadio.org/audio/mustardseed/