Starting in the summer of 1940 until her death, Oelrichs was in a long-term relationship with Margaret Wise Brown, the author of many children's books. The relationship began as something of a mentoring one, but became a romantic relationship and they lived together at 10 Gracie Square beginning in 1943.
In 1940, Blanche Oelrichs published her autobiography, "Who Tells Me True."
Another book of Oelrichs' poetry was published in 1928 under the title "Selected poems, by Michael Strange" and the following year she married a third time to the prominent New York attorney Harrison Tweed who later became Chairman of Sarah Lawrence College.
Her first collection of poems was published in 1916 under the pen name Michael Strange.
Blanche Oelrichs developed a "literary urge" in 1914 when she began creating works of poetry and theatrical plays.
In 1910, Blanche Oelrichs married her first husband Leonard Moorhead Thomas, the son of a prominent Philadelphia banker, with whom she had two children, Leonard Jr. (1911–68) and Robin May Thomas (1915–44).
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