A brother? I still can't believe it

When he reunited with the alternate version of his family in this new world, Matt was greatly surprised to learn that he had an older brother here, a rather surprising fact since in his original world he never had any siblings as far as he knew. At first, he didn't know how to react: confusion, intimidation, sadness? Or perhaps all of those things in a huge whirlwind of confusing emotions that were finally calmed by a big, strong hug from his new... brother. Who, by the way, is named Alex Landeros.