In the evenings, usually between 4 and 6, one or both of them are back in their chairs, sipping white wine. Sometimes they have Chardonnay and sometimes Sauvignon Blanc. I can tell by the colour. Mostly, Chardonnay wins out.
I don't walk past their place later at night so I don't know what they do then.
I have a soft spot for them because when I've met them on the sidewalk they smile and often say hello. They've also planted 1,000 daffodils in their front yard (along with the abundant grape hyacinths that are already there). You just have to like somebody who would give that sort of spring gift to the neighbourhood.