Sibling Rivalry
Nanny cams are great because they’re not just used to watch over nannies. You can place them in your elderly parent’s room to make sure that their caregivers are actually giving them the care they need. Unfortunately for this person, or fortunately depending on how you feel about the situation, this person learned a harsh truth about their sister.
Apparently, she had been speaking to their elderly father about cutting the OP out of his will and hand everything over to her upon his passing. What a terrible sister and an even worse daughter! Just do what normal families do and wait for the parent to pass before getting into a huge legal battle with your siblings!