Hebrews 1:6 (ESV)
And again, when he brings the firstborn into the world, he says,
"Let all God's angels worship him."
Jesus, the first born. That is the first to rise from the dead, “ And we know that for those who love God all things work together for good, for those who are called according to his purpose.  For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers.  And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.” (Romans 8:28-30 (ESV)
The only begotten, is obviously the First born. He is the first born among many brothers, those of us who believe in him, are his brothers. Adopted into God’s family through Jesus Christ, we are then strong to pray, “Our Father, who art in Heaven,” and all God’s angels worship Him. This is quite important. The Angels worship Jesus. No one is allowed to worship anyone but God. That Jesus is worshiped by Angels, and that He allows others, like Thomas, to worship him shows that he is God, and claims to be so.