Jerusalem Talmud Kiddushin 4.9

משנה: מִי שֶׁיָּצָא הוּא וְאִשְׁתּוֹ לִמְדִינַת הַיָּם וּבָא הוּא וְאִשְׁתּוֹ וּבָנָיו וְאָמַר אִשָּׁה שֶׁיָּצָאת עִמִּי לִמְדִינַת הַיָּם הֲרֵי הִיא זוֹ וְאֵילּוּ בָנֶיהָ אֵינוֹ צָרִיךְ לְהָבִיא רְאָיָיה לֹא עַל הָאִשָּׁה וְלֹא עַל הַבָּנִים. מֵתָה וְאֵילּוּ בָנֶיהָ צָרִיךְ לְהָבִיא רְאָיָיה עַל הַבָּנִים וְאֵינוֹ מֵבִיא רְאָיָיה עַל הָאִשָּׁה.

MISHNAH: If somebody left for overseas together with his wife; he returns with his wife and her children and says, “the wife with whom I left for overseas is this one and those are her children,” he does not have to bring proof either about the wife or the children. “She died and those are her children,” he has to bring proof about the children but not about the wife.

הלכה: מִי שֶׁיָּצָא הוּא וְאִשְׁתּוֹ לִמְדִינַת הַיָּם כול׳. רִבִּי אַבָּהוּ בְשֵׁם רִבִּי יוֹחָנָן. אִישׁ וְאִשְׁתּוֹ עָשׂוּ אוֹתָן כִּשְׁנֵי עֵדִים. חֲזָקָה אֵין אִשָּׁה שׁוֹתֶקֶת עַל בְּנֵי חֲבֵירָתָהּ. רִבִּי אָבוּן שָׁמַע לָהּ מִן דְּבַתְרָה. אִשָּׁה נָשָׂאתִי בִּמְדִינַת הַיָּם הֲרֵי זוֹ וְאֵילּוּ בָנֶיהָ. רִבִּי אַבָּהוּ בְשֵׁם רִבִּי יוֹחָנָן. אִישׁ וְאִשְׁתּוֹ עָשׂוּ אוֹתָן כִּשְׁנֵי עֵדִים. חֲזָקָה אֵין הָאִשָּׁה שׁוֹתֶקֶת עַל בְּנֵי חֲבֵירָתָהּ.

HALAKHAH: “If somebody left for overseas together with his wife,” etc. Rebbi Abbahu in the name of Rebbi Joḥanan: They considered a man and his wife as two witnesses since it is general knowledge that a woman will not be silent about another woman’s children. Rebbi Abun referred this to the later statement: “I married a wife overseas, this is she and those are her children;” Rebbi Abbahu in the name of Rebbi Joḥanan: They considered a man and his wife as two witnesses since it is general knowledge that a woman will not be silent about another woman’s children.