וַיַּגֵּ֨ד יַעֲקֹ֜ב לְרָחֵ֗ל כִּ֣י אֲחִ֤י אָבִ֙יהָ֙ ה֔וּא וְכִ֥י בֶן־רִבְקָ֖ה ה֑וּא וַתָּ֖רָץ וַתַּגֵּ֥ד לְאָבִֽיהָ׃
And Jacob told Rachel that he was her father’s brother, and that he was Rebekah’s son; and she ran and told her father.
Read halakhic rulings (Jewish law) on Genesis 29:12: and classical halakhic sources.