Here’s the second sentence of the 18th Conlang Relay Text
sū mamō salōmme ñi matūmse manīsen marēwa;
The word mamō refers to a young man. The word in the text I got talked about a boy, but this did not fit with the idea of who this character ought to be. As I mentioned earlier, with a little tweaking, this story was about two legendary Kēleni culture-heroes. Using the word for young man rather than boy was part of the tweaking.
The locative phrase sū mamō salōmme is “In the young man’s arms…”.
isn’t actually a kinship term. mārja refers to the female head of the clan, who is usually one of the older females in the clan.