For some reason my comment isnt showing up as a reply, so out of curiousity ill risk posting the same theory for a 3rd time. If the stans are the kids' GREAT uncles, then they must have a sibling. UNLESS, one of them had a baby & is actually their grandfather.

wait, i keep googling this and i am surprised i cant find anything about it. They are their grunkles. GREAT uncles, meaning they are siblings to their grandfather OR one of them is the grandfather and the baby was one of theirs making one of them the grandfather.

But how if the stans are their GREAT uncles not regular uncles? Either one of them have to be the grandfather or theres another sibling in the picture? Or am i completely overthinking..

So wait, who was the baby that the twins' mom was holding when Stanley was being kicked out???