“Are angels God’s sons?”
The Old Testament contains five occurrences of the phrase “sons of God”; three in Job and two in Genesis. All five appear to me to be referring to angels. The New Testament gives us a further six mentions. Every one of these six refers to redeemed members of the human race.
That requires a little more explanation, but hey, that’s why we do this. Let’s go back to front, since the question is about angelic sons.