Brittany Runs a Marathon (2019) touches on this when the protagonist’s roommate and her child become a surrogate family, only to have their bond tested by public shaming and Instagram perfectionism. The modern blended family must navigate not only the internal resentments of loyalty, but the external gaze of social comparison. Are we happy enough? Are our "step" relationships Instagrammable? This pressure is a new, distinctly 21st-century poison that cinema is only beginning to fully dramatize.
If you want to look deeper into this topic, tell me if you want to explore:
: Cinema is moving beyond biological ties to embrace "chosen families," where kinship is defined by shared survival and support rather than DNA. Wiley Online Library 2. Key Themes in Contemporary Portrayals Stepparent-Child Friction