1881 Scotlands people census has
Archibald Braynian,(a mis-type for Braynion?) born c. 1842, Braco. Perthshire, a general labourer,
living at Clackmannan
with his wife, Elizabeth, born 1844 at Blackford, Perthshire.
Their children include William and Elizabeth Mather Braynian both aged 14.
If you check these twins on Family Search, Archibald Braynion and Elizabeth Miller are given as their parents.
(As the record for the Archibald born at Muthill in 1844 on Family Search is only a submitted record, perhaps he really was born in 1842 at Braco?)