Shri Gurucharitra indicates that Gangadhar belonged to the Deshastha Brahmin family of kaundinya gotra.
It is not known how many children he had but he frequently mentioned his "poorvaj" (Ancestor) called Sayandev who was one of the four close disciples of Narasimha Saraswati.
Gangadhar wrote 52 chapters in which he describes the life and philosophy of Shripad ShriVallabha and Narasimha Saraswati.
It is quite possible (according to experts such as R. C. Dhere) that he had the Sanskrit version of the Gurucharitra written by Narasimha Saraswati's disciple, Siddha, and he may have translated that into Prakrit language, i.e. Marathi.
Later, in the 19th-20th century, Vasudevanand Saraswati, alias Tembe Swami, (1854-1914) wrote a Sanskrit version of Shri GuruCharitra.