  Henry’s worry here can be expressed as follows. If a relation such as fatherhood is identified with a pair of accidents, then it will follow that fatherhood is partly in the son (since the pair is such that one of its members is in the son). But this is absurd. Fatherhood is an asymmetrical relation (or as Harclay prefers to put it, a relation involving superiority and inferiority). That is to say, fatherhood is such that if an individual a has it in respect of another individual, b, then b cannot have fatherhood in respect of a. But according to Harclay, this is tantamount to saying that “fatherhood is in the father alone and not in the son”. And of course he doesn’t think the point is restricted to fatherhood. On the contrary, it also holds true of all relations, including symmetrical relations or “those involving equals, even if it is not as clear” (“Utrum Dei,” n. 47).