People

brother

Source:*bratrъProto-Slaviccertain

I knowI'm learning

English

brother

Polish

brat

Cognate· distant (Indo-European)Same source — the sound laws connect them.

In all five languages

BCS script

Latin under Cyrillic

Russian
братbrat
bratinherited
Ukrainian
братbrat
bratinherited
Polish
brat
bratinherited
Czech
bratr
ˈbratr̩inherited
Czech alone keeps the old final -r.
Bosnian-Croatian-Serbian
bratбрат
bratinherited
English
brother
Distant English relative — Brother, Latin frater and *bratrъ go back to one Indo-European word.