Hi, Daniela –
Have you seen the website that translates some of our articles into Romanian? I wonder if it might list some books or other resources that have been translated. (Since I can’t read Romanian, I’m not sure what all is on that site!)
A great way to teach your children English would be to use the Gouin Series approach that Charlotte Mason used. This post describes how to do the method. I don’t think Cherrydale Press has Romanian books available yet, but they may be working on Russian. You might e-mail Alyson there and ask. The way their books are formatted, you can learn from English to Russian or go the other way from Russian to English. So if she has Romanian or Russian available, that could be very helpful.
The only audio book I have read is Ancient Egypt and Her Neighbors, which is not really for 3 and 5 year olds; but, you might enjoy it. We also have our weekly blog post available as an audio; you might subscribe to that if it would be helpful.
You might see if the audios by Jim Weiss are available as downloads. He has some sweet stories for your little boys, such as First Stories to Last a Lifetime and Tell Me a Story! A Treasury of Classics.
I hope these links give you some ideas and some resources to help. I wish I knew of classic books that have been translated for you; maybe someone else on this forum can chime in with that information.