Because Triga Altman is not the son of Diga Altman, the relationship between Triga Altman and Diga Altman is a parallel universe. Generally speaking, Triga Altman is another Diga in the parallel universe. So this also explains why many monsters in Tricia Altman's plot are very similar to those in Diga Altman's film and television dramas.
For example, the three dark giants in Diga Altman, Kesaya Goyajova Camilla, Dalam and Chitra, and Ksenya Goryachova Camilla, Hitram and Dagong in Teliga Altman. At the same time, in the nineteenth episode of Triga Altman, Diga Altman appeared, which also confirmed that the two are only a relationship in the parallel universe. In the recently aired episode 19, the Kirialod people appeared.