And this is what Lana and Boso would look like in their teens - adulthood
I say it again for the new ones, in my interpretation of Bambi's second book, Lana and Boso are children of Ronno and Rolla, here Rolla is NOT Faline's sister but is her best friend from adolescence, so she is not Geno's and Gurri's aunt, and Lana and Boso aren't their cousins.

Boso, like in the book, grew up as a grumpy deer, somewhat aggressive, just like his father Ronno. The difference is that, in itself he didn't hate Geno, like his father to Bambi, but Boso hated the idea that Geno wanted to be with Lana; Boso's sister. Boso was jealous and always tried to take care of his sister.

On the other hand, Lana grew up being a delicate, feminine and beautiful doe. Lost in love with Geno, longing for the day he would fight other deer for being with her, who would have guessed that Geno would have to fight Boso himself for Lana.