Face id
in my iphone from my face id my brother is able to unlock my iphone
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About Face ID advanced technology - Apple Support - https://support.apple.com/HT208108
"The probability that a random person in the population could look at your iPhone X and unlock it using Face ID is approximately 1 in 1,000,000 (versus 1 in 50,000 for Touch ID). As an additional protection, Face ID allows only five unsuccessful match attempts before a passcode is required. The statistical probability is different for twins and siblings that look like you and among children under the age of 13, because their distinct facial features may not have fully developed. If you're concerned about this, we recommend using a passcode to authenticate."
Also worth reading: My family can unlock my iPhone Face ID - Apple Community