If my parents are filing bankruptcy do they still need to appear in court regarding a summons for a credit card debt?

Question Details:

My parents received a summons from an attorney for a credit card default. Do they need to appear? I am going to file Chapter 7 for them but am not sure what to do about the summons. I know that we do not want to go to a secured debt.Both my parents are retired; their only asset is their apartment that is worth $300,000.00.

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