Seis de la noche.
eran
fueron

To tell the time in Spanish in the past, we use two forms of the verb ser. First of all, the word era is used when talking about one o'clock and eran is used to talk about other hours. Since in this sentence we are talking about six in the afternoon, then we must use the word eran. Finally:

Eran las seis de la noche.

these are the words to choose from to people answer the question:

nieta--yerno--tia--tio--primo--nuera--abuelo--cunada