Questions & Answers about Eles são irmãos gémeos.
Why does gémeos come after irmãos instead of before it?
In Portuguese, adjectives usually come after the noun they describe. Here, gémeos (twin) acts as an adjective describing the noun irmãos (brothers/siblings), so it follows it, unlike the English word order.
Could Eles são irmãos gémeos mean "They are a twin brother and sister"?
How would this sentence change if we were talking about twin sisters?
What does the accent mark on gémeos do?
The acute accent on the first e tells you two things: it shows which syllable gets the most emphasis, and it tells you to pronounce it with an "open" E sound, similar to the E in the English word "pet".