action filled contemporary book whereby the protagonist is a twin and faked his death and his twin and family believed him dead

[Motu]

Looking for this book-action filled contemporary book whereby the mc is a twin and faked his death and made his twin, and family believed he died in an explosion. I don't really remember much of the plot but I remember that one of the twin was uptight and always smartly dressed and the other twin was a joker and liked wearing hawaiian shirts. It is a series and I remember it being action-filled with explosions, guns and all those things. I dont recall but the entire family might be military or involved in special ops.