0 a son or daughter from another marriage of a person’s wife or husband. -- nevlastní syn/dcera/dítě
My impression is that it is, in order to exclude stepsons, stepdaughters, and similar relations.
Therefore, the partner of a stepson living across the city is regarded as a close relative.
The surviving partner of a stepson is an example.
They may be a stepson, a half-brother, or a half-sister.
It is an arbitrary list that includes sons-in-law, but not nephews; stepsons' wives, but not nieces; grandparents, but not great-aunts and uncles.
I consulted both my stepson, who is 24, and my favourite stepdaughter, who is 17.
I know all about him, because the gentleman in question happens to be my stepson.
As a birthday present to his stepson, he threw him out.
