What is the etiquette on sending thank you cards for receiving sympathy cards for the death of a loved one?

My mother passed away recently. Her partner held a memorial service. For those who attended the memorial service, my mother’s partner plans to send out thank you cards addressed from all of us. I personally received some sympathy cards, as well as flower and fruit arrangements. I have sent out thank you cards for the flower and fruit arrangements. Should I send out thank you cards to people who sent me sympathy cards? If they came to the memorial service and also sent a sympathy card, they are getting a thank you from my mother’s partner, should I also send a thank you card? I want to do what’s right but not go overboard. Thanks all!