I lost one of my children unexpectedly. How should I explain that if people ask how many kids I have?

I only have my son now. This is so hard for me to talk about. When it comes up in conversation “how many kids do you have?” I just choke up and have no idea what to say. Any advice is helpful.

I lost one of my children unexpectedly. How should I explain that if people ask how many kids I have?
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