Adam and Steve (2019)

Adam and Mary, two gay siblings, decide to bring their partners home for Christmas dinner. They really don't want to come out though, so they come up with a plan; they'll swap partners and pretend to be two straight couples. After a tragic first encounter with Grandma, who has a lot of opinions about children out of wedlock, foreigners and - bread, Steve can't take it anymore and threatens to leave. Adam has his way of persuading him, but that may involve the two of them, a tiny cupboard under the stairs, and a very high chance of Grandma walking in.