What is the authenticity of the narration about Umar and his wrestling with the Jinn? And is it true that Abu Talib did not have many children, but rather only four sons?

Al-Tabarani and Al-Darimi narrated that Ibn Mas'ud said: "A man from among the companions of the Prophet, peace and blessings be upon him, met a jinn and wrestled him. The human overpowered him. The jinn asked him to wrestle him twice more, and each time the human overpowered him. Then the jinn said to the human: 'You will not recite Ayat al-Kursi in a house but that Satan will leave it, braying like a donkey, and will not enter it until morning.'" When Ibn Mas'ud was asked about the man, he said: "Who could he be but Umar, may Allah be pleased with him?" Al-Haythami authenticated the hadith in Majma' al-Zawa'id.

Abu Talib's children were six: four males (Talib, Aqil, Ja'far, Ali) and two females (Umm Hani', Jumanah). As for the statement in some biographical books that Abu Talib had a large family, this may be relative to the time and place, or it may be a weak statement from its very foundation. Dr. Muhammad bin Abdullah Al-Awshan, in his book "What Became Widespread but Was Not Proven in the Prophetic Biography," considered the story in which it was mentioned that Abu Talib had a large family to be weak, as its chain of transmission has two defects: irsal (a missing link) and the 'an'anah (reporting with 'on the authority of') of Ibn Abi Najih, who was a mudallis (one who conceals defects in narration). It is unlikely that the chief and leader of Quraysh would be unable to support his children.