Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.

Sentence: 'The Geographical Facts about Maseru reveals that the capital city of Lesotho , Maseru lies on the bank of the Mohokare River and bordering the continent of South Africa .', Argument/Subject 1: 'maseru', Argument/Subject 2: 'lesotho'
be capital of

Sentence: 'Horus was the son of Osiris and Isis .', Argument/Subject 1: 'horus', Argument/Subject 2: 'isis'
be son of

Sentence: 'A six-year member of the USTA Middle States Section Board , he began a two-year term as Tennis Industry Association President in January 2007 .', Argument/Subject 1: 'president', Argument/Subject 2: 'board'
be member of