Is it possible, by studying blood groups, to accurately determine whose son, if the parents

Is it possible, by studying blood groups, to accurately determine whose son, if the parents of one of the boys have blood groups 2 and 3, and the parents of the second have 1 and 2?

Red blood cells can have their own specific properties. These are the antigenic properties of blood. In total, a person has four blood groups. Knowing the blood types of the mother and father, you can determine the likelihood of a child having a certain blood type. If parents have 1 and 2 groups, then the child can receive 1 and 2 groups. If the parents have groups 2 and 3, then the child can receive any of the four groups. Therefore, we will not be able to accurately define parenting. In this way, parenting can be determined only in certain cases.