It appears that the Senate win by Rand Paul in Kentucky marks a first in congressional history. It is the first time that a son has served in the Senate while his father served in the House of Representatives.
Ron Paul of course is a congressman from Texas, and a former GOP contender for president.
There have been other instances of fathers and sons serving in Congress together. Of note, Sen. Ted Kennedy of Massachusetts and his son Patrick serving as a Congressman from Rhode Island. But in that case it was the father in the upper house and his son serving in the lower house.
And there was a father and son that served in the Senate simultaneously. Henry Dodge of Wisconsin served in the Senate from 1848 to 1857 and his son, Augustus Dodge, was a Senator from Iowa, from 1855-1858.