OET interlinear 1 YHN (1 JHN) 5:12

uW Translation Notes:

Note 1 topic: figures-of-speech / metaphor

ὁ ἔχων τὸν Υἱὸν, ἔχει τὴν ζωήν; ὁ μὴ ἔχων τὸν Υἱὸν τοῦ Θεοῦ, τὴν ζωὴν οὐκ ἔχει

the_‹one› (Some words not found in SR-GNT: Ὁ ἔχων τόν Υἱόν ἔχει τήν ζωήν ὁ μή ἔχων τόν Υἱόν τοῦ Θεοῦ τήν ζωήν οὐκ ἔχει)

John speaks of believers who are in a close relationship with Jesus as if Jesus were their possession. If it would be helpful in your language, you could use a different expression. Alternate translation: [Anyone who is in a close relationship with the Son has life. Anyone who is not in a close relationship with the Son of God does not have life]

Note 2 topic: figures-of-speech / metaphor

ἔχει τὴν ζωήν & τὴν ζωὴν οὐκ ἔχει

˓is˒_having ˓is˒_having (Some words not found in SR-GNT: Ὁ ἔχων τόν Υἱόν ἔχει τήν ζωήν ὁ μή ἔχων τόν Υἱόν τοῦ Θεοῦ τήν ζωήν οὐκ ἔχει)

Since both groups of people are physically alive, John means this in a spiritual sense. As in 4:9, he is likely referring to what he calls “eternal life” in 3:15 and 5:11. See how you translated that term in those verses. Alternate translation: [has power from God to live as a new person now and will live forever in God’s presence after death … does not have power from God to live as a new person now and will not live forever in God’s presence after death]

Note 3 topic: guidelines-sonofgodprinciples

τὸν Υἱὸν & τὸν Υἱὸν τοῦ Θεοῦ

(Some words not found in SR-GNT: Ὁ ἔχων τόν Υἱόν ἔχει τήν ζωήν ὁ μή ἔχων τόν Υἱόν τοῦ Θεοῦ τήν ζωήν οὐκ ἔχει)

Son and Son of God are important titles for Jesus that describes his relationship to God.