"わたしのおとうとはむずかしいきょうかしょを読んでいます。"

Translation: My little brother is reading a difficult textbook.

[Kickastina]

I used "younger brother" and that was marked wrong.

[Sinah_]

Me too.

[IsolaCiao]

Marked correct 10/23/17

[V2Blast]

It's accepted for me now.

[Azrael89]

Same here

[Marqws]

私の弟は難しい教科書を読んでいます。

[ttnsam13]

Younger brother and little brother is synonymous. As a matter of fact my "little" brother is 6'5" and 340 lbs. He would not be considered little.

[Takkun11]

Thanks, it was really helpful to know about the details of your little or should i say "younger" brother

[ChannelleC]

Yeah I originally wrote 'younger brother' thinking Duolingo might not like me writing 'little brother' but it was the opposite haha. Same thing anyway, should mark both right I reckon

[A_Root]

Is there an actual reason "my little brother is reading difficult textbooks" shouldn't be accepted? Or is it just that the mods need to add more accepted answers.

[OTT182749]

Weird flex but ok

[Nic88J]

Think the sound says わとしの instead of わたしの. Reported it (may 2019)