THE SISTER IN LAW 1974 (MILL CREEK)

This is a bizarre film starring W.G. MacMillan who also starred in George Romero's The Crazies back in 1973, and John Savage.
It's about two estranged brothers who come together and find themselves in a world of trouble. Robert (Savage) is talked into delivering a package to Canada by hie brother Edward (MacMillan) and as soon as Ed sees what's in the package he wishes he had never said yes.
The ending is both brutal and sad, but it does help this little piece of weird 70's drama. I think you should try this film and see if it's your cup of tea.