A relational noun such as father can take two arguments, e.g.
(1) a. Bill is Jane’s father.
(2) a. Jane’s father is friendly.
It is, I believe, natural to view the relational noun father in (1) as a predicate taking the two arguments Bill and Jane. Given this analysis of father in sentence (1), I am wondering how father in sentence (2) is analyzed, since it is functioning there as the subject argument of the predicate is friendly. One might render the predicate-argument analyses of these two sentences as follows:
(1) b. father (Bill, Jane)
(2) b. friendly (Jane’s father)
It seems that there is a qualitative difference across sentences (1a) and (2a) regarding the semantic status of father. In particular, what are the arguments of the relational noun father in sentence (2a)? Can we still view father in (2a) as taking two arguments? If yes, what is the other argument of father there – the one argument of father in (2) is obviously Jane?
Any tips about where this issue is addressed in the literature on predicates would be much appreciated. Thanks in advance!