It's been awhile since I read this but from what I remember the mc have a special bloodline he self destruct when he was captured in the future and was reborn to the past. He was too late to save his sister but not his nephew. He fought for the custody of his nephew who like him have a space ability. The ML is a experiment but the boss of MC in the future.
@Renn Kazma https://www.novelupdates.com/series/apocalyptic-rebirth-earths-vast-changes/ And here's the spoilers in NU forum https://forum.novelupdates.com/threads/bl-apocalyptic-rebirth-earth’s-vast-changes.75357/