How many kids did Samson in the Bible have?

none

That is not true. One of the Midrashim - which is the Hebrew commentary on the Hebrew bible - says that Samson (and Delilah) did indeed have children and that they lived elsewhere in the land of Israel, in a place where gold was: Havilah. So, the Bible doesn't really mention children perhaps, but commentators to the Bible, who studied the Bible in the years after the second destruction of the Hebrew Temple, interpreted the story with children to Samson and Delilah. I guess those children were half Jewish (or Hebrew) and half non-Jewish(Philistines).