Can a brother and sister get married according to the Bible?

Leviticus 18:9; Deuteronomy 27:22

Is it okay to elope? What does the Bible say about eloping?

Exodus 20:12

Can a stepsister and stepbrother marry according to Leviticus 18:11?

Leviticus 18:1

What does the Bible say about marrying your first cousin?

Leviticus 18:7-17