I wrote "Bisy kepa ñuha issa" and it was marked wrong, why?
Maybe because it could sound as "this father is my". Remember that HV has SOV sentences (subject + object + verb)
No, because bisy cannot be an adjective.
What's the difference between "bisy" and "kesy"?
Bisy is used for animate nouns (e.g. people), kesy for inanimate nouns (e.g. swords)