How can I extend my 3-month Non-O marriage visa for another 60 days in Thailand?

I believe that the OP has the answers needed for his question.

Thanks all for your helpful replies.

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You can apply for a 60-day visit family extension. At most offices, they give you this 60 days starting as of the application date, while some offices add (top up) 60 days to your current stamp.

You need to check with your local office for their policy about when this 60-day starts and their exact requirements for this to decide when you want to apply for it.

Here is the general information about a 60-day family visit extension.