Psycho In-Law (2017)

It's been two years since Tina's husband-to-be, Brock, lost his first wife in a tragic accident. Tina's only obstacle is Joyce, Brock's former mother-in-law, who is determined to stop the marriage. Joyce's attempts to disrupt the happy couple escalate until Joyce commits one murder and plans that Tina herself is next--even if it must happen at her wedding.