Imagine Loki stumbling upon Frigga’s personal journals that she had hidden. It takes him a few weeks to get to the volume from the time when he was first brought to Asgard. In shock he rereads her words again and again; he has a twin. Odin had ordered Frigga to choose which would be kept and which would be left to die. She couldn’t let one baby live while the other died so she bound Loki’s brother into a mortal form as well as his magic, then behind Odin’s back she sent Loki’s twin to a future time on Midgard in an alternate reality. Frigga’s spell located the most suitable couple and placed the baby with them as well as inserted knowledge of the child’s existence into all records and memories. She was rather thorough. Out of curiosity Loki adapts Frigga’s spell and goes to hunt his brother down. When he arrives he finds that his twin is a very popular entertainer; well loved and adored by millions. Invisible, Loki observes his brother with a longing to speak to him which he gives into after a few days and it makes the poor guy, known as Tom Hiddleston, think he’s had some kind of mental break because of stress.