Let parent ⊆ People × People denote the relation {hp, ci : p is a parent of c}. What familial relationships are represented by the following relations? For the sake of simplicity in the following...

Let parent ⊆ People × People denote the relation {hp, ci : p is a parent of c}. What familial relationships are represented by the following relations? For the sake of simplicity in the following questions, assume that there are no divorces, remarriages, widows, widowers, adoptions, single parents, etc. That is, you should assume that each child has exactly two parents, and any two children who share one parent share both parents