TL;DR & SPOILER ALERT!
Boring movie, with a lousy script. The efforts the characters took to save the younger sister in the 1st movie was all for nothing when she conveniently got killed off in this one, at the start.
Makes me wonder if there was some dispute with the actress playing the younger sister with other cast members or the studio that lead to her character getting killed off, because I feel like this was supposed to be like a series involving 2 siblings exploring the supernatural world, ala Supernatural tv series.
And... the 'antagonist' was a major letdown. A husband having an affair with his wife's sister ends up killing said lady and his biological daughter through that affair. Wow... I pity whoever was unlucky enough with the task of possibly re-writing the complete mess of a script. Such a wasted opportunity of what could have been a good trilogy, perhaps even a cinematic universe.