Jerusalem Talmud Yevamot 15.8

משנה: אָמְרָה מֵת בַּעֲלִי וְאַחַר כָּךְ מֵת חָמִי תִּינָּשֵׂא וְתִיטּוֹל כְּתוּבָּתָהּ וַחֲמוֹתָהּ אֲסוּרָה. הָיְתָה בַת יִשְׂרָאֵל לַכֹּהֵן תֹּאכַל בַּתְּרוּמָה דִּבְרֵי רִבִּי טַרְפוֹן. רִבִּי עֲקִיבָה אוֹמֵר אֵין זוֹ דֶרֶךְ מוֹצִיאַתָּהּ מִידֵי עֲבֵירָה עַד שֶׁתְּהֵא אֲסוּרָה לְהִינָּשֶׂא וַאֲסוּרָה מִלּוֹכַל בַּתְּרוּמָה.

MISHNAH: If a woman went overseas with her husband and she returns and says “my husband died and then my father-in-law died”, she can remarry and collect her ketubah, but her mother-in-law remains forbidden. If she was the daughter of an Israel married to a Cohen, she should eat heave, the words of Rebbi Tarphon. Rebbi Aqiba says, in this way one does not remove her from sin unless she be forbidden to remarry and forbidden to eat heave.

הלכה: קִידֵּשׁ אַחַת. וּתְהֵא נֶאֱמֶנֶת לוֹמַר מֵת חָמִי. לֹא כֵן סָבְרִינָן מֵימַר. כְּשֵׁם שֶׁאֵינָן נֶאֱמָנוֹת עָלֶיהָ כָּךְ הִיא אֵינָהּ נֶאֱמֶנֶת עֲלֵיהֶן. אָמַר רִבִּי חֲנִינָא. תִּיפְתָּר שֶׁהָיָה חָמִיהָ כָן וְסִיְימָהּ.

HALAKHAH: “If he was betrothed to one.” Should she not be trusted to say “my father-in-law died”? Did we not hold that just as they are not trusted about her so she is not trusted about them? Rebbi Ḥanina said, explain it if her father-in-law was there and she described the circumstances.