I want proof from bible that allow to marry your relative , I want to convince christian

What sort of relative ?

The Bible, Genesis 28:2, cousins are OK to marry

Each of the following individuals in scripture were in the lineage of Mary, Christ's mother, or Joseph, his "earthly" father, who were chosen by God to raise His son. Most, if not all, occurred (chronologically) after the time in which Levitican law was written. Zelophehad's daughters did as the LORD commanded Moses. Zelophehad's daughters, Mahlah, Tirzah, Hoglah, Milcah and Noah, married their cousins on their father's side (Numbers 36:1-11).

Milcah was married to her cousin, Nahor. They had a grand daughter named Rebekkah. In Genesis 24:48-51, the story unfolds of how, against all odds, God's direction for her to marry her cousin's son Isaac (first cousin once removed) is made crystal clear.

Isaac and Rebekkah had two son's. Jacob was the son whom was blessed to fulfill God's prophecy that the descendant's of Abraham (Jacob's grandfather, Isaac's father) would become a great nation. Isaac instructed Jacob to marry a daughter of Rebekkah's brother. Although he immediately fell in love and became engaged to his cousin Rachel, his uncle tricked him into first marrying Rachel's sister Leah. Although God blessed Jacob greatly, Jacob suffered much grief and heartache for having married both sisters. Jacob's descendants became what is now known as the twelve tribes of Israel. (Genesis chapters 19 and 29)

In I Chronicles 23:22, Eleazar's daughters married their first cousins.

The following marriages are prohibited:
Stepchildren (Lev 18:8,17) – NOT blood related – only through marriage
Stepsisters (Lev 18:11) – NOT blood related
Daughter-in-law – d
Sister-in-law (Lev 18:16) – NOT blood related(Lev 18:15) – NOT blood relate
Step-granddaughter (Lev 18:17) – NOT blood related

Did Fr_Chuck mean NOT prohibited?