Mason trueblood is the middle child along with his other middle brother Dylan. If you don’t know the order here you go: Cameron (oldest), Dylan and Mason (the two middle brothers), and Ethan (youngest). Dylan and Mason share the middle sibling positions in age and birth order.

This is based off that one scene in that pierce the veil music video where there at work you can be any gender and any appearance you guys are at work and he is a emo rockstar