(DO NOT READ THIS IF YOU DONT WANT SPOILERS AND HAVENT FINISHED THE SERIES YET!)
So, I have a theory for SEASON 3 of the Umbrella Academy. When they used the briefcase to get back home to 2019, Reginald Hargreeves was there and said, "I'd eventually knew you'd come". The Umbrella Academy members were shocked to see that their father was alive. The members then said they were back "home" in the umbrella academy house, but not really, Sir Reginald Hargreeves introduced them to the Sparrow Academy". I thought of that and realized, when they were invited by their own Father(Reginald Hargreeves) Five had talked about the things they had done in the future and how they were his kids and how they got scattered around in Texas 1963. Basically, my point is that they must have caused something to change the timeline or Reginald Hargreeves probably had done something so he could avoid them, so instead he adopted other children and called them the "Sparrow Academy". They probably must have powers as well. What if they cause something worse? Another Apocalipse? The Umbrella Academy and Sparrow Academy team up to save something from happening? Lets just wait a till they talk more about SEASON 3, IF THEY ARE EVEN MAKING ONE?!
The Ending of Season 2
This is my THEORY, what do you think of this?