וַיַּ֣רְא יוֹסֵ֗ף כִּי־יָשִׁ֨ית אָבִ֧יו יַד־יְמִינ֛וֹ עַל־רֹ֥אשׁ אֶפְרַ֖יִם וַיֵּ֣רַע בְּעֵינָ֑יו וַיִּתְמֹ֣ךְ יַד־אָבִ֗יו לְהָסִ֥יר אֹתָ֛הּ מֵעַ֥ל רֹאשׁ־אֶפְרַ֖יִם עַל־רֹ֥אשׁ מְנַשֶּֽׁה׃
And when Joseph saw that his father was laying his right hand upon the head of Ephraim, it displeased him, and he held up his father’s hand, to remove it from Ephraim’s head unto Manasseh’s head.
Read halakhic rulings (Jewish law) on Genesis 48:17: and classical halakhic sources.