People can be sometimes related to particular families when simply listening to their voice production. They may share similar biological attributes, such as density and length of the vocal cords or some other parameters that make their voices nearly identical at least in auditory terms.
I suppose their vocal codes have identical (for the twins) or very closely relatedcompositions
Twins and relatives share a lot of characteristics and biological attributes in common such as density and length of the vocal cords, shape and size of other organs of speech in the vocal tract together with other parameters leading to a similarity of voice at least in auditory terms. This issue is open to researchers to find out some other results related to features of voice quality within the framework of instrumental Phonetics.
Even if genetic factors may contribute to similarities in the vocal fold morphology and viscoelastic properties in twins, many other environmental factors contribute to the development of the vocal folds (thus, the vocal fold's anatomy will probably differ more and more with the age). However, one should not forget that the identification of a person based on the voice does not only depend on the vocal fold vibration: indeed, a large part of the identification process relies on the resonance cavities/the vocal tract, defining the voice's caracteristic "timbre". Again, genetics will probably induce a similar morphology of the vocal tract in twins (pharynx, oral and nasal cavities), thus resulting in similar reinforcement of the voice signal's harmonics. Furthermore, the smilarity with other family members is also caused by the resembling linguistic habits amongst members of the family system (i.e. choice of vocabulary, syntactic constructions...), as well as the use of similar prosodic patterns.
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