There are still about 50 people with Shanuk (Шанюк) surname living in Zhytomyr.
I do not see any Stadlin.
Did any of the family stay in Ukraine?
Were they born in Zhytomyr or just lived there from 1870s to 1905? There are metric books on Zhytomyr Churches in Zhytomyr State Archives but I would need to know the details to be able to tell more. Do you know any dates? Birth/marriage/death?
Also, there must be census lists since 1897 there as well.