Natan appears in numerous family trees as the 6th son of Gershon Shaul (Yom Tov) Lipmann Heller and Rechel Teomim Ashkenazi but none of the "researchers" (and I use the term very loosely) provides a source. Can anyone provide a source? If not, the curator should add a note to that effect. Note also that "Lajosh" is probably a misspelling of the Hungarian given name Lajos.
Most sources indicate that Tosfot Yom Tov and his wife had four sons and at least six daughters. The sons, whom he mentions in his works, were: Moses of Prague, Samuel of Nemirow, Abraham of Lublin, and Leb of Brest-Litovsk. The daughters of whom we know were: Nechle, Nisel, Doberish, Esther, Rebecca, and Reizel.