The Lord and His Christ

[Sam]

Psalm 2:2-3 says:
The kings of the earth set themselves,
And the rulers take counsel together,
Against the LORD (YHWH) and against His
Anointed (Christos or Christ in the Greek, Mawsheakh or Messiah in Hebrew)
saying,
Let us break Their bonds in pieces
and cast away their cords from us.

Acts 4:25-26 where the first century disciples are praying
they quote this verse:
who by the mouth of Your servant David have said:
The kings of the earth took their stand,
And the rulers were gathered together
Against the LORD and against His Christ.

Revelation 11:15 says:
The kingdoms of this world have become the kingdoms of our Lord and of His Christ, and He shall reign forever and ever!

In Psalm 2, the Lord and His Christ are referenced in the plural with the pronoun "their" as being two separate beings or persons or offices.

In Acts 4 it seems that those first century Christians spoke of the Lord's Christ as His holy child Jesus

I have heard the passage in Revelation 11:15 where the word Christ is used to refer to His anointed ones i.e. the His people or saints or church

I do not read Hebrew or Greek. Is the term for Christ or Anointed One in Psalm 2, Acts 4, and Revelation 11 singular or plural in the original languages? Does "Christ/Messiah/Anointed" mean the anointed Son of God (Jesus the Christ) or the anointed sons of God (the Church of Jesus Christ)?