Genesis 6:10

And Noah begat three sons, Shem, Cham, and Japheth.

SHEM, HAM, AND JAPHETH. It appears to me that Japheth was the oldest, as it is said, the brother of Japheth the elder, and so in counting their generations, Scripture mentions the children of Japheth first., 10:2. Ham was the youngest of all, as it is said, And [Noah] knew what his youngest son had done unto him., 9:24. Here, however, Scripture mentions Shem first because of his superiority and then Ham, for they were born in that order. Thus Japheth is left at the end. But Scripture did not want to say, “Shem and Japheth and Ham,” because in that case all of them would have been mentioned out of the order of their birth, and Japheth had no outstanding quality to merit that the order of birth be dispensed with on his account. Shem, however, is mentioned here first because of his superiority even though in the account of the generations he is last. Similarly, [we find the verses]: The sons of Abraham: Isaac and Ishmael; And I gave to Isaac Jacob and Esau.

ויולד נח, as soon as he began to rebuke his fellowmen he was granted children

ויולד נח, why does the Torah mention this now when it had already told us about his three sons in 5,32? The Torah wanted us to know that these sons were born after Noach had already been certified by the Torah as “walking with G’d.” Mention of these sons here indicates that he raised his sons to believe in G’d and to walk in His ways, also. Had his sons not been good people they would not have been saved at the time of the deluge, even though their father was a righteous person. We have already cited Ezekiel 14,20 in which we were told that Noach’s merits did not suffice to save others beyond himself and his wife.