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@neon: I'm pretty sure that the Boy is supposed to be Seina Yamada's son by Kiriko Masaki, as the boy's Forehead-bandaid--along with the other bandaids--implies he's always getting hurt like Seina. You can also see on page-07 that Seina had kids with Amane Kaunaq and Ryoko Balta.
@neonn That would be Kiriko & Seina's son, whom at the end marries two of Tenchi's daughters.
If you'd like to see a little easter egg, checkout the last page of Kamidake Onsen 11. All three of their child silhouettes are present, in that image of Tenchi & Seina's families watching Kenshi battle Babalun/Gaia. As are the three cabbits Ryo-ohki has in her basket.
Short rundown. Ryoko and Ayeka have tenchis kid. Seina had a family with his wives but only Amane, Kiriko, and Ryoko Balta kids were shown. Amane left her kid in their care...fast forward you now have the luckiest and most powerful family in the universe.
it feels good to be a tenchi fan just noticed that ryoko's daughter was on the cover of Omatsuri Zenjitsu no Yoru Tenchi Ban 6.12 https://e-hentai.org/g/446174/089d01cb85/