At the rehersal dinner, Rainbow Dash and her family were sitting at a table, until Sprocket got their attention.
"Attention everypony", announced Sprocket "I would like to thank you all for coming to celebrate my marriage with Lightning Dust"
Everypony clapped, except Dash
"So if anyone would like to say your congrats. Go ahead", said Lightning Dust
"I'll say something", said Dash standing up
Soarin quickly pulled her down.
"Dash don't do it", said Soarin "You'll make things worse"
"Oh Soarin, it's already been worse", replied Dash
Dash flew up to the stage.
"Let me say a couple things about my awesome brother Sprocket. Actually, he's not awesome. He's a jerk", announced Dash
The crowd gasped.
"What's mom doing?", asked Razor
"I don't know", replied Soarin
"Yup, you heard it here folks. Sprocket is a jerk. He'll bring you nothing but sadness, shame, and he'll leave you during the toughest times. And Lightning Dust, after this wedding he'll dump you in a week", announced Dash
Everypony started to talk. Dash was pulled aside by Sprocket. Then Dust, Soarin, and Scootaloo walked up to them.
"What the heck are you doing?!", asked Sprocket
"Telling everypony a little bit about you", replied Dash
"C'mon Dash, what did I ever do to you?!"
"You know dang well what you did"
"Ok, can somepony please explain to me what the hay is going on? Cause I think I just missed a step", asked Scootaloo
"Soar Scoots, watch the kids", ordered Dash "I need to talk to my brother"
Soarin and Scootaloo stood there for a moment.
"…alone", added Dash
"Oh right", replied Scootaloo
Soarin and Scootaloo left, thus leaving Dash, Sprocket, and Dust alone.
"Ok, so why are you mad at me?", asked Sprocket
"You left me when I needed you the most", explained Dash
Ah, I see what you did there.
But, first, let me give you some advice.
The story is good. You have good grammar (Not that I'm proof, but I know how bad grammar looks). You just need to make bigger chapters. Make bigger plot. Chapter must have minimum 1k words. Other than that, story is great.
I wish you luck with other stories!