Hi Yaroslav, your main question was about how to find "older relatives." Do you mean your own grandparents and their generation, and further back? I was told when I first began -- begin at home. Talk to your family, and perhaps interview them. And then find the documentation to back up what they have told you. As you find more, show them, and ask more questions! You may find relatives you have never heard of, and they may tell you even more! "MyTrueAncestry" will not be much help. The typical DNA tests which offer matching and other DNA data will be far more useful to you, especially as you use it on Wikitree!