What modern cinema does best is quiet observation. Look at — a family where the live-in housekeeper is more of a mother to the children than the biological mother. Or C’mon C’mon (2021) — where an uncle (a temporary step-parent figure) takes custody of his nephew, and the film explores the exhaustion and beauty of two people who didn’t choose each other, but are learning to.
One of the primary dynamics explored in modern cinema is the "collision of cultures" that occurs when two established units merge. Films like (2014) and Yours, Mine & Ours