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The only passage that somewhat addresses this is 1 Corinthians 7:14-- "For the unbelieving husband is sanctified because of the wife, and the unbelieving wife because of her husband. Otherwise your children are unclean, but now they are holy." So I wouldn't say it's "more" important, but that it has consequences for the children. It would be helpful to have more context for your question, but I'm not sure there's a "most important" relationship besides the one we have with Jesus.
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