Can Catholics participate in a non-Catholic wedding?

My son is getting married in a civil ceremony.
He and his fiancée are Catholics not practicing their faith.
My wife and I have decided to attend the wedding.
Is it permissible to allow our 16 year old son to be in the wedding party?

The following link should help answer your question about wedding participation. If you have any further questions, please contact Catholic Answers directly.
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What are the rules for attending weddings?

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