I think it's great. The beginning is so nice. I love it. I would just center it on the invite it might take more space or you could center your parents like this
Mr Dad and Ms. Mom
same last name
Like that then it would'nt look so long. I've seen invites where the parents took up two lines before and it still looked great.
Go to your wordperfect or whatever one you have and center it and type it up and then print it so you can see what it looks like before the invites and you can play around with it till it looks perfect to you.