364J: Russian (?) siblings go live on a farm when orphaned (Solved!)

This is actually two books that I remember reading many times in the 70’s. These were two novels. The plot was that two siblings were orphaned and went to live on a farm. Maybe they were Russian or Ukrainian? I remember the description of the girl being given a special costume to wear that had many many skirts. I also remember a description of the Wax, Dyed Eggs at Easter. I think they went to the special fair and got a very decorated cookie. The Farm was stocked with lots of food, including sausages hung in the pantry. The second novel was a little darker, because I believe there was a war.
Thank you for any help you can give with these two books.

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