1. In terms of blood relationship, if A is a nephew, B is an uncle and C is A's father, then B and C are brothers;

2.b is the brother of C; B's son Ding and Jia are cousins.

3. As far as inheritance is concerned, if B leaves a legacy after his death, but there is no will or legacy in advance, legally speaking, C is the second heir of B;

4. If all the first heirs of B, including B's parents, spouse and children, cannot inherit for various reasons, then C can inherit, and C died before B's death, then A, as a direct blood relative of C, B's direct nephew can be regarded as a subrogation inheritance person, and inherit the part of the inheritance that should be inherited by C but not inherited.