"Uh..." Wil looked down, unable to look her in the eye. "I have an idea, yes. Can we talk about it later?" Like when their son wasn't around. He didn't think he'd be able to put her off until the kids were gone, but maybe if he had at least a few hours, he could figure out some way to explain his thought process that wouldn't completely piss her off.
He knew that was unlikely and wouldn't blame her for being angry.