FMA fanfic- Their biggest mistake...

Alphonse Elric couldn't sleep. He was thinking about what he and his big brother were trying to do. Whether they could do it, whether they should do it and whether it actually was impossible. He let his thoughts drift back to when his mother was alive. Happier, peaceful times.

The morning came, bright and sunny, exactly the opposite of how Alphonse was feeling. What if Ed was wrong? He never had been before; about learning alchemy, sneaking into their father's study. But…no-one had ever succeeded in this before. What if it he really was wrong about this? What if it really couldn’t be done?
“Al! Come on! We’re going to be late!” Edward waved to him from a little bit ahead. He pushed the negative thoughts to the back of his mind and smiled.
“Coming, nii-san!” Alphonse sprinted to catch him up then the two brothers raced each other into the school gates, laughing freely. Alphonse thought then that maybe they needed their mother, so they could laugh like this all of the time. Maybe they could bring her back. This pang of hope that went through him, stayed in his mind, keeping his resolve solid.

“Are we really going to do this, nii-san?” The two boys were sat on the floor, staring at the transmutation circle they had just drawn. Edward nodded.
“We have to. We have to bring mama back so we can see her smile again. I want to see her smile again.” Alphonse looked at the various ‘ingredients’ in the middle of the circle. Could they really make their mother from them? Would this really work? Even if it did work, was it really a good idea? The flame of hope inside Alphonse grew, pushing the doubts from his mind. If it worked, he would see his mother again. He would be able to play with her, laugh with her and show her things which would make her smile. He wanted that more than anything.
“Al, your hand.” He held it out, allowing his brother to cut it as he had cut his own.
“The last ingredient.” Alphonse said.
“Let’s hope it’s the right one.” Ed said, allowing a droplet of his blood to be added to the ingredients. Alphonse followed suit and both of them put their hands on the circle around them. The circle glowed and all thoughts of doubts leaving their minds as they thought of the possibility of seeing their mother smile at them once more.