I just started playing with Story Progression a few months ago. This is the second family I have played. In both families, my Sims relationships were at 100% and faithful until I had them try for a baby. At which point one of them rejected the other for no reason I can discover and I had to work them back up to the mood. For both couples, I realized after the babies were born that the husband and wife were now just romantic interests and everyone wanted to see them get married. I have seen a few threads about it but no one seems to have any idea except to say it is a glitch. This seems pretty consistent. If it is a percentage chance I need to change or something please let me know. Thank you!

This doesn't sound like NRaas SP's doing to me, but hopefully until we figure out why it's really happening you know that you can set them back to married using MC?
NRaas > MC > (Sim) > Intermediate > Long Term Relationship by Category

Is this household always the actively being played one or are you rotating around or ever playing other households in this game?
<a href="http://nraas.wikispaces.com/Story+Progr ... ettings</a>