#Your servant our father

They refer to their father as "Your servant" to show respect. AT: "Our father who serves you"

#They prostrated and bowed down

These words basically mean the same thing. They laid down in front of the man to show him respect. AT: "They bowed down in front of him" (See: [[:en:ta:vol2:translate:translate_symaction]])

#he lifted up his eyes

This means "he looked up." (See: [[:en:ta:vol1:translate:figs_idiom]])

#his mother's son, and he said

This can be translated with a new sentence. AT: "his mother's son. Joseph said."

#Is this your youngest brother ... me?

Possible meanings are 1) Joseph is truly asking a question to confirm that this man is Benjamin, or 2) it is a rhetorical question. AT: "So this is your youngest brother ... me." (See: [[:en:ta:vol1:translate:figs_rquestion]])

#my son

This is a friendly way one man speaks to another man of lower rank. AT: "young man" (UDB)