Apple iPhone Reads My Sisters Face Too!! Security Breach Unbelievable

The Face ID of my Apple phone also reads my sister's face and turns on the screen. I don't quite understand from what they say when they protect my personal info?? my data is all out in the open, frankly, what kind of nonsense is this? It is not really believable to experience such a problem in a brand that constantly states that it attaches importance to security. I'm really freaked out about this huge security breach. I just can't wrap my head around how such a big flaw could even happen. I've always trusted Apple to prioritize security because I'm a loyal customer. But, like, it's really concerning to come across this problem, ya know? It makes you question if the device's security claims are actually legit. please look into this situation and figure out why this unexpected behavior is happening.  hope they can give me clear explanations and fix things up quickly so I can trust the brand again. looking forward to your speedy response and a solution that makes sure my Apple device is secure.