Board Thread:Help/@comment-26250264-20150327152456/@comment-4902593-20150531060920

The only Titans who are shown to have kids with humans are Helios, Hecate, Eos and maybe Selene. Although these demi Titans aren't as strong as demigods, and they are fewer in number.

Also in Percy Jackson's Greek Gods, Deucalion is said to be completely mortal, even when his dad is none other than the Titan, Prometheus, the dude who created humanity and the Human race.