Can you give more information?
Is the non-Catholic another Christian person? Are they actively going to church, or not that interested? Are they an atheist? Do they come from a back ground that may be anti-Catholic? For example, are the parents in a church that are anti-Catholic?
When I go to church and see a husband and wife, together, kneeling, praying, going up for communion together in a reverent way, their children and my children witness that. When they do the sign of the cross, when they wait in line for confession, they are showing by example what God has put in place for our salvation.
Likewise, if the children see one parent going to church on Sunday and the other parent does not, and won’t go over the years, that also shows the children that you can totally ignore the God stuff and there is no lightning bolt that comes down. There are no consequences. How bad is sin, really, if one parent never goes to church, to communion, or confession? Not that bad would be an easy conclusion. How can the practicing parent impress on children that sin is bad and God has a plan for us when the other parent can totally ignore all that?
Not only are we to gain graces for ourselves, but for the whole world! The world is desperate for God grace! Two people, married to each other, and practicing their faith, impact the world for good. They are stronger together. I wish I could give that desire to single people who are looking for their life partner! Do not settle for less than that. Your choice impacts your children and your grandchildren. God bless and guide you!