I wish you all the good in the world, for you to be healthy, and happy with your new family. I wish you many happy years together and beautiful children.
Remarks about the translation
"casă de piatră" is a Romanian expression used for wishing newly married couples many happy years together. If translated literally, it means "house of stone"....
If I may say something more about "casă de piatră" - it is the greeting we use at the weddings, as azitrad said. Means that we wish their marriage to be as durable as the stone-made houses are.
But azitrad translated it perfect, I doubt it exists such a wish in English.