Been almost a year since I last posted here. Getting ready for a three week trip to Ireland (my first). So I've gotten my Tierney binder out to try and get my ducks in a row.
After reading your entry about Patrick and Thomas living so close in SF, I tracked all the city directories I had printed on those early years. I found Thomas at the same address as Patrick and his son John. The 1894/95 directory page 1390, has them all living at 24 Otis Place. So perhaps they were related.
One thing that bothers me is not seeing anyone named Thomas in my line. You know how they named the boys after their fathers and brothers, etc.