How do we understand that Jesus is the Everlasting Father, when there is the first Person in the Triad. Who is the Father of Jesus Christ? Please explain the Holy Book of Isaiah 9:6 in the light of the Orthodox dogma.
You should differentiate between the "Father" as a hypostasis and the "everlasting father" as a title to the Son. Our Lord Jesus Christ is the everlasting father, or the father of eternity; one with the Father who is from everlasting to everlasting. "I and My Father are one" (John 10:30); "He who has seen Me has seen the Father" (John 14:9). The Septuagint reads "father of the world to come", the kingdom which shall have 'no end'. He is the father of the great work of redemption that is the true proof of His love as the everlasting father.