Not all children born to consanguineous parents will necessarily have problems, but the chances of problems will be higher, mainly due to the presence of the same disease-causing gene. There is a high probability that couples with close relatives have the same gene, and if this gene is inherited in an autosomal recessive manner, then children born to couples with close relatives will have a higher probability of developing malformations, such as phenylketonuria, congenital heart disease, albinism, etc. It is recommended not to marry between close relatives, although it is not certain that all children will have problems. It is recommended that close relatives do not marry each other. Although it is not certain that the child will have 100% of the problems, the chance of the disease will be higher than that of non-consanguineous people. Although non-consanguineous people also have disease-causing genes, they do not belong to the same category, so the incidence rate is naturally lower.