About 母亲 and 父亲
I usually say 妈妈 and 爸爸. What is the difference? More formal? Are they used in Mainland China or outside (for example Taiwan..)?

Question

Answer

父亲 means father
母亲 means mother
妈妈 means  mom/mummy
爸爸 means day/daddy 
父母 or 双亲 means parent
so you can easily find that they are the same
but 父亲,母亲 and 双亲 are usually used in   formal ways

Answer

妈妈 and 爸爸 are like mom and dad. 母亲 and 父亲 are like mother and father. So yes, they are more formal. And I am pretty sure they are used in any Mandarin-speaking country.

Answer

妈妈 = Mum
爸爸 = Dad
母亲 = mother
父亲 = father

Answer

父亲母亲 are more formal. imho, it is a bit strange to call my parents 父亲 and 母亲 at home.

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