Growing the Family Tree

For quite some time now, I've been using a service called Geni to keep track of my family tree. Actually, I've been able to get a couple of other relatives on there to also manage it. Unfortunately, things come to an end only three generations above me. It'd be nice to have more of my living family on there, but I'm even more curious about my ancestors from Ireland, Wales, Germany, and Ukraine.

Right now, I haven't any details about either grandfather's ancestries, and as for my grandmothers, I have only their parents. My mom's maternal grandparents are Irish (my great-grandfather being a Belfast man), and my dad's maternal grandparents are from Silesia (at the time, part of Germany, but now in Poland).

It'd be great to learn more about their histories, as well as those of my grandfathers, but it's tough. Especially seeing how my paternal grandfather is a bit reticent to discuss his family. It's a bit easier with my mom's father, but it's been a while since we've had a family reunion on that side (or at least one that I've known about and attended).

Hopefully I'll be able to find out more, and expand my knowledge of my family and its history.