Confession: I love Bad Dad movies. I eat them like candy. Bad Dad, Bad Husband, Bad Stepdad, all of & #39;em!
And lately my recs have been full of these so I& #39;m kinda living for the melodrama. Anyway, to the point, there& #39;s a trend over the past handful of years or so:

The straight wife/mom character has an Incidentally Lesbian Sister. It isn& #39;t something that& #39;s talked about a lot but we see her partner, or she mentions she& #39;d like to have one, along those lines. She just happens to be gay, nbd.

As representation it& #39;s kinda bullshit but it beats none, so An Effort Was Made-level points, but here& #39;s my favorite thing:
She& #39;s usually the adult who knows what& #39;s really going on! There may be a child or two who also does, but Incidentally Lesbian Sister, you can COUNT on.

Most recently spotted in Dylan Walsh vehicle (yes that& #39;s a real thing that I really said) THE STEPFATHER (2009). Not all that recent, but an awesome example. I ate this well-cast trash with a SPOON.
Paige Turco, as Incidentally Lesbian Sister, Jackie, predictably is wonderful...

While Sherry Stringfield is Jackie& #39;s partner, Leah, and though barely shown, also wonderful, naturally. Minor spoiler, Leah does not put it together like Jackie, but her character is joyful and sweet, a nice note here.
I& #39;ll be on the lookout for more Incidentally Lesbian Sisters!