Does the 1-year Non-O retirement visa in Thailand allow for dependent spouse and child visas?

To emphasize one of the important points Tod stated, you cannot apply for your non-O visa at Penang until after your husband is already on the 1 year extension. Him just having the 90 day non-O visa that he converted to is not enough. You would have to wait until he has the full extension first.

The answer will seem convoluted, but yes that visa does allow "trailing spouse/child" matching extensions

BUT

with that being said you cannot get the initial 90 day Non-O visas based on being a trailing spouse or child issued INSIDE thailand based on the primary visa holder being on retirement.

You would have to have the husband get his 90 day Non-O visa and year extension THEN you'd have to go to a nearby consulate (Penang seems to be the only one in the area) to get the 90 day Non-O visas for the spouse and child.

Once you got those and there was less than 30 days left on the 90 day stamps you'd get when you entered you could then apply for a matching extension to your husbands 'retirement' visa/extension providing you met the requirements