Hi 80's or early 90's horror comedy movie set in wales i think it was a werewolf im not sure i only remember bits but there was two old male twins and this guy went to rescue his sister with a chainsaw
The only horror comedy of that period that I know of was set in Wales was
House of The Long Shadows but there were no chainsaws to speak of.
My review of it is found on the Submitted Reader Reviews child board.