A casual encounter between siblings

This is one very unique scene that I came across recently when surfing through some amateur content videos online. It was quite different compared to what we usually see here because both characters involved are family members — specifically sister-in-law & brother-in-law.and they were just getting along for an evening of relaxation together after work hours ended. It started off as usual; you know how many times people find themselves doing mundane activities while still smiling inside? Well guess who shared my thought process exactly during their time spent watching TV quietly until something caught his eye outside which then led them into trying out new things within their living room space itself?