Isaac in Islam
The biblical patriarch Isaac (or) is recognized as a patriarch, prophet and messenger of God by Muslims.
In Islam, he is known as Isḥāq.
As in Judaism and Christianity, Islam maintains that Isaac was the son of the patriarch and prophet Abraham from his wife Sarah.
Muslims hold Isaac in deep veneration because they believe that both Isaac and his older half-brother Ishmael continued their father's spiritual legacy through their subsequent preaching of the message of God after the death of Abraham.
Isaac is mentioned in fifteen passages of the Qur'an.
Along with being mentioned several times in the Qur'an Isaac is held up as one of Islam's prophets.
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Jacob in Islam
Yāˈqub ibn Isḥāq ibn Ibrāhīm يَعْقُوب
إِبْنُ إِسْحَٰق إِبْنُ
إِبرَٰهِم
(literal:
Jacob, son of Isaac, son of Abraham ; also later "Isra'il"
, Arabic:
إِسْرَآئِیل
["ˈisraāˈiyl"];
Classical/ Qur'anic Arabic:
إِسْرَآءِیْل ["ˈisraāãˈiyl"]), also known as Jacob, is a prophet in Islam.
He is acknowledged as a patriarch of Islam.
Muslims believe that he preached the same monotheistic faith as did his forefathers: Abraham (Ibrahim), Isaac (Ishaq) and Ishmael (Ismail).
Jacob is mentioned 16 times in the Quran.
Two further references to Isra'il are believed to be mentions of Jacob.
In the majority of these references, Jacob is mentioned alongside fellow Hebrew prophets and patriarchs as an ancient and pious prophet who stayed in the "company of the elect".
Muslims hold that Jacob was the son of Isaac and that he preached the Oneness of God throughout his life.
As in Christianity and Judaism, Islam holds that Jacob had twelve sons, each of which would go on to father the Twelve Tribes of Israel.
Jacob plays a significant role in the story of his son, Joseph (Yūsuf).
The Quran further makes it clear that God made a covenant with Jacob and Jacob was made a faithful leader by God's command.
His grandfather (Ibrahim), father (Ishaq), uncle (Ismail), son (Yusuf) and himself are all prophets of Islam.

Question: Who is Jacob In Islam's paternal grandmother?
Answer: Sarah