Halakhah su Genesi 46:1
וַיִּסַּ֤ע יִשְׂרָאֵל֙ וְכָל־אֲשֶׁר־ל֔וֹ וַיָּבֹ֖א בְּאֵ֣רָה שָּׁ֑בַע וַיִּזְבַּ֣ח זְבָחִ֔ים לֵאלֹהֵ֖י אָבִ֥יו יִצְחָֽק׃
Israel si pose in viaggio, con quanto gli apparteneva; e, giunto in Beer-Sceva, fece sagrifizi al Dio di suo padre Isacco.
Shulchan Arukh, Yoreh De'ah
A person is obligated to honor his father-in-law. Gloss: And some say that a person is not obligated to honor his grandfather, but this does not appear correct to me. Rather he is obligated in the honor of his father more than that of his grandfather (Maharik, Root 44). (And the proof is from the midrash regarding [Gen 46:1], "and he offered sacrifices [to the God of his father, Yitzchak]").
Ask RabbiBookmarkShareCopy