Those may be his parents but I doubt they are still married. I don’t see a ring on mamma’s hand.
That’s kind of silly.
There are lots of reasons why a woman might not be wearing her wedding ring. I haven’t worn mine in years, except for special occasions. It’s too big for me now, it’s an heirloom engraved twice over 100 years, and can’t be cut.
And I never wore it routinely around the house anyway, for fear of damaging it with all the stuff I do.