Thanks very much, Phyllis. Yes, in 1900 Sylvia was living with Spencer and Jenny Loomis - Jenny was Charlotte's (Lottie's) sister. According to the family, both Theodore and Charlotte died young, but I haven't been able to fill in the gaps between Sylvia's birth in 1875 and her appearance in 1900.
I'm going to spend a few days in the Capital District in June and hope to make some progress then. Again, thanks very much for your assistance.