What was the relationship between Tamar and Boaz?
Boaz descended from Perez, the son of Tamar. At his wedding to Ruth, the elders of Bethlehem remembered Tamar. Ruth 4:12, 18-21
What the Bible says
Ruth 4:12
And that the house may be, as the house of Phares, whom Thamar bore unto Juda, of the seed which the Lord shall give thee of this young woman.
Ruth 4:21
Salmon begot Booz, Booz begot Obed,
Douay-Rheims Bible (Challoner revision), public domain.