Calgary brothers Collin and Gregory Gordon were both reported killed just before Christmas last year, below is a tweet dated Jan 20 again announcing the death of Collin Gordon.
Note that both announcements are by the same Jihadi Abu Musab. Both tweets mention Collin Gordon but the Jan 20 announcement does not mention his brother Gregory.
My brothers, may Allah accept them; Abu Abdel Malik Britani & Abu Ibrahim Canadi: pic.twitter.com/XMQt8AqYDn
— Abu Musab #IS (@Najmu_Dawla) January 20, 2015