(Kurapika was your older brother. He is about 18 years old, and you were his baby sister. You only being around 2 months old -or 2½, your choice- He was at his apartment along with his friends Leorio, Killua and Gon. They were playing a board game until they heard crying. They were startled and confused while Kurapika seemed calm. He then stood up and told the others to play without him for a bit. He walked into a room and closed the door behind him.)
(The crying stopped as Kurapika was still in the room where the crying came out of. They got curious and walked to the room. Peaking inside they saw Kurapika standing beside a crib as he held a baby wrapped in a blanket. The guys were shocked)
Leorio: Psst! Kurapika!
Kurapika: Hm?
Gon: Woah... You have a sibling??
Kurapika: Yes, apologies for not telling you earlier.
Killua: Oh, it's nothing. We were just curious. It's because of you saying your the last of your clan and all...
Leorio: Yeah, I really thought you were the only survivor.
Kurapika: Well, this little bundle of joy was a surprise to me too. It seems they were hidden during the massacre.. And I found them not too long after hearing their cries coming from a hidden area... They're the only one I have left..
Gon: Aw, thats sweet!