I'm taking this week to do some more digging on HMLKKBCJ - Hattie Mabelle Lynn Knapping Kittridge Barker Childs Jacobs.

I found another directory listing from 1897 in Worcester Mass for her as Mabelle Lynn, Mrs., a music teacher, at 345 Park Av. "h. do." What does that stand for?  In the abbreviation index it says h. = house and do. = ditto.  Ditto what? She lived and taught at home?

She's also listed in 1898 at the same address.  In 1899, she moved to 11 Murray Ave.

In 1906, she and Henry Jacobs are listed in the real estate record section of the Worcester City directory as follows:
Jacobs Henry L & Mabelle L. Childs, 5 Benefit, blds $5100; 4320 ft. $2800.
I'm going to assume she did NOT own a building with Henry and have that info published in a city directory while she was married to Harry. But hey, you never know.

The contents page says "Real Estate Record: A complete transcript of the city assessors' books relating to real estate, showing name of owner, size of lot, and valuation of every estate in Worcester." Why are there two prices? Does that mean they bought the building together before they were married?

She is listed in 1898 city directory as Alhambra Mandolin, Guitar and Harp Club Director, and in 1899 and 1900 as Alhambra Mandolin, Violin, and Harp Club Director.  She was also listed under orchestras as the Director of the Alhambra String Quartette.

I am trying to find any ancestors, and it seems that her cousin May Belle Grace Dadnum (1876-1941) married Henry Irving Everett (1877-1921), and they had a son Dana Whiton Everett(1915-1985). He married Doris Emily Jenner (1916-2000) and they had a daughter Dorothy L Everett who died in 1978 at the age of 40.  But she apparently had children, and so far that seems the only possible connection to Mabelle.