Landline (2017)

As one review I read pointed out, nobody dies in this movie.  It is set in the mid-nineties and is a light musing movie on adulthood and monogamy and sisterhood, washed in nostalgia for a time period where the landline was the main source of communication.  No distracting scenes with cell phones that occupy much of the conversation--both as a source of information and the center of it. The revelations are gentle, but worthwhile.
It is a two sister Manhattan family, one daughter is late in high school and the other is early in her post-college career.  Their parents have significant conflict, and while it isn't new, when the sisters discover their father's long standing infidelity it really rocks their already gently swaying boat.  They act out in their own ways, causing a ripple effect of discord across their own lives, and their ability to support each other in the end is a nice homage to the enduring nature of sibling support.  Never minimize the effect that an unstable marriage has on the family, and be nice to your siblings because they may be what you end up relying on in the end.