На вечеринке было 15 человек: родит

На вечеринке было 15 человек: родители друга и его друзья

Результаты (английский) 1:

15 people were at the party: the parents of a friend and his friends

Результаты (английский) 2:

At the party, there were 15 people: parents and other of his friends

Результаты (английский) 3:

At the party was 15 people: parents friend and his friends