Therese Grob was the daughter of Heinrich Grob and Therese Männern (died 22 August 1826). She was born in Lichtental, Vienna. There was one other child, a boy called Heinrich (1800 - 1855) who was two years younger than Therese. The father died early in Therese's life. The widowed mother continued to run the small silk-weaving business that Heinrich Senior had established. The premises were very near to Schubert's home. Therese had an attractive soprano voice, and the young Heinrich was a talented painist and violinist. The two families grew close through music-making.
Therese sang in the Lichtental parish church, which Schubert had been attending since he was a child. For the church's centenary celebrations, the young Schubert completed his first mass in late July 1814 — the Mass in F, D.105 — and Therese sang the soprano solo at the premiere performance, which Schubert conducted himself.
Schubert's application in April 1816, eventually rejected, for the post of music teacher at a teachers' training college in Ljubljana (then known as Laibach) may have been in part driven by his awareness to gain some financial security to make marriage to Therese possible. Schubert assembled an album of songs for Therese, the last of which is dated to 1816.
On 21 November 1820 Therese married Johann Bergmann (1798 - 1875), a baker. Together they had one child, a daughter, Amalia Bergmann (9 July 1824 - 24 December 1886).
Eight years after the composer's death, Schubert's brother Ignaz married Therese's aunt Wilhelmine.