וַֽתַּהֲרֶ֛יןָ שְׁתֵּ֥י בְנֽוֹת־ל֖וֹט מֵאֲבִיהֶֽן׃
Thus were both the daughters of Lot with child by their father.
Targum Jonathan on Genesis
And the two daughters of Lot became with child by their father.
וַֽתַּהֲרֶ֛יןָ שְׁתֵּ֥י בְנֽוֹת־ל֖וֹט מֵאֲבִיהֶֽן׃
Thus were both the daughters of Lot with child by their father.