Omg YAY I was waiting for someone to recognise that!!! Yep, canonically Quinn/MC is Filipino (as is yours truly)!!! You have no idea how happy this comment has made me :D
As for meeting the younger brother, unfortunately he is past the age of being respectful towards his elders (being a preteen and all)... The only time he would call us Ate or Kuya is if your mom forced him to XD (he's kinda based on my real life younger brother, who tbh hasn't called me Ate in years XDDD)
Thank you so much for playing!!! So glad you enjoyed it sm <333333