I Handed Over a Time Portal, and My Whole Family Helped the Country Fight the Japanese

Other people transmigrate and end up struggling to get by. Our family of seven awakened seven heaven-defying Systems from the start! My dad signs in and gets weapon blueprints as a reward; my older brother blows up his own body; my older sister stops time to assassinate her targets, my younger sister rewinds time, and my mom is even more outrageous: she starts a group chat and recruits heroic spirits! Me? I open the door, send my whole family of immortals through, then bring back the gold!