The one of NOTMAA with Xenia's boys can't be earlier than 1910, because the littlest boy, Vasili, would only have been three. 1912 sort of makes sense, he also looks around 5. 1915 makes sense as well, he would be about seven or eight. I'm iffy about 1912, because that would have been the year of Spala, but depending on which year this was taken (early Jan-Feb etc. 1912 or Dec-Jan 1912/13) the latter would be struck out as Alexei wouldn't have been up walking. So maybe it's either early 1912 or sometime 1915