Even "Uncle". In english, Mom's brother and Dad's brother both are uncles ¯\_(ツ)_/¯
What's fun though is that 'farbror' can also be used (in Swedish) for any neutral/kindly spirited or acquainted old man, so maybe we're not too practical after all.
English has "avuncular" as an adjective to describe any friendly uncle-like person.
You can have a mother-in-law, a brother-in-law, a son-in-law, but there's no such thing as an uncle-in-law.
I'm curious to know how common this is. It was always the norm for me, but sometimes I got the feeling I had accidentally mislead people when talking about my 'uncle' (Mum's sister's husband), whom they expected to be a blood relative of mine.