In John 17:10--"καὶ τὰ ἐμὰ πάντα σά ἐστιν καὶ τὰ σὰ ἐμά, καὶ δεδόξασμαι ἐν αὐτοῖς"--what is the number of ἐμὰ and σά? I didn't learn either of those forms in my paradigms for συ or εμε. Biblehub.com http://biblehub.com/text/john/17-10.htm insists that they are (nominative) plural, which doesn't seem to jive with the KJV's "And all mine are thine, and thine are mine; and I am glorified in them." (Use of the KJV because it distinguishes number in pronouns). This website http://alt-usage-english.org/pronoun_paradigms.html confirms the KJV's usage as being singular.
This doesn't make much sense to me at this point, because it seems that the Son has been addressing the Father and referring to himself (so it should be singular). It seems to me that in the preceding verses John is using forms of those same pronouns in a somewhat unusual way, e.g. the dative σοι at the end of v. 6 "σοι ησαν καμοι αυτους εδωκας" "Yours they were, and to me them you gave" (my fairly formal equivalence translation). This isn't an entirely unusual way for John to use the dative--see John 1:6 for example--"Ἐγένετο ἄνθρωπος, ἀπεσταλμένος παρὰ Θεοῦ, ὄνομα αὐτῷ Ἰωάνης·" the last phrase is a similar usage of the dative for possession. I can deal with the possessive usage of the dative, but here John seems to be using the nominative for possession, and even more unusual is the plurality of pronouns that should be singular.
Is there a source that confirms these words to be plural? What would be the paradigm for them in the plural?