The relationship coefficient is 1/4. According to the relevant public information, there is12 genetic similarity between parents and each child, and12 genetic similarity between brothers and sisters. The probability that two individuals have the same gene at a certain locus is called the relationship coefficient. The relationship coefficient between father and son or between brothers and sisters is 1/2, that between grandchildren and uncles is 1/4, that between cousins is 1/8, and that between uncles is116. ............