Chapter 1 did great in getting you hooked. You feel how the sisters are struggling and how much they care for one another. But the older sister was so stressed that she ultimately lashed out and said things that she regretted, and it ended up being the absolute worst thing for them, with her sister dying tragically.
You feel the regret and pain for the character rather easily and sympathize with them and want to see what happens next, especially with the ending of the phone that had the date set back years ago. Great job.