I cannot believe that "martyrdom at Alapayevsk" makes anyone worth an OWN article. If they are terribly noteworthy just as Alapayevsk martyrs, they could be at some such page, such as Alapayevsk martyrs. If they are noteworthy as members of Russian imperial house, then they are mentioned in some such list. Anyway, they could be presented in their father's page as requested above (at least the father has here an own article, where his offspring can also be presented).