Who were Noah’s children? Did he have any? How did the world become populated after the flood (he only took animals on the ark, right? – not a wife or kids or anything?)? I’m having trouble constructing genealogy of Judaism.

Noah had three sons: Shem, Ham, and Japheth (Genesis 5:32 and 6:9). Noah, his wife, and his three sons and their wives all were on the Ark (Genesis 7:13). The offspring of those three sons (which form the basis of the 70 root nations of the world) are given in Genesis 10:1-32. More specifically, the genealogy from Noah to Abram (later Abraham) is given in Genesis11:10-26. In conclusion the order is as follows:

Noah
Shem
Arpachshad
Shelah
Eber
Peleg
Reu
Serug
Nahor
Terah
Abraham

All the Best,
R’ Daniel Fleksher