en_tn/gen/43/28.md

he lifted up his eyes

This means "He looked up." (See: rc://en/ta/man/translate/figs-idiom)

his mother's son, saying

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

Is this your youngest brother...

Possible meanings are 1) "It is a rhetorical question with the alternate translation: 'So this is your youngest brother...'." 2) "Joseph sought confirmation that the man was indeed Benjamin, his brother."

God be gracious

"May God be gracious"

my son

This is a friendly way one man speaks to another man of lower rank.