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Even within Indo-European, "basic" words like 'father, brother' are not stable in meaning. English 'fart' and 'arse' happen to be a couple examples of stable lexemes. The dad word did not mean biological father, but 'protector'. Note that celibate priests are addressed as 'Father'. Latin for your biological father was 'genitor'. The IE bro-word meant, a male agnate within three generations, That's why Greek needed to come up with 'adelphos' from '*bhrater adelphos' brother of same womb', as opposed to 'homopator' 'bro of same pater'. In Serbian 'brat' can be your cousin, as well as your male sibling; Magyars borrowed the Slavic word as barát 'friend'.
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