Thomas Martin Einstein
Albert Einstein had three children, Lieserl Maric (1902–1903?), Hans Albert Einstein (1904–1973), and Eduard "Tete" Einstein (1910–1965), but only Hans Albert is known to have married and had children. Hans Albert's only biological child to survive to adulthood was Bernard Caesar Einstein (1930–2008), who was a physicist and the father of Thomas Martin Einstein.
Jor-El
Einstein then traveled incognito to Smallville to seek out a suitable family; this required his sneaking away from fawning government handlers assigned to protect/baby-sit Einstein as a vital national resource. In the course of several days in Smallville, he encountered Jonathan and Martha Kent, and decided that they would be ideal foster parents for the Kryptonian child, due to their honest and generous natures. Through a variety of ruses, Einstein arranged for the Kents to be in the immediate area when Kal-El's spaceship landed, thus ensuring he would be found and later adopted by them.