That's a big life decision. I've lived in Europe my whole life, but I have a lot of friends and relatives in the US. I've also lived in 3 different European countries, and of course I know people from just about all the Western European nations. There's a lot got you to think about. This is only a small part, off the top of my head: - If you're American, you pay tax worldwide. Most countries have higher tax than the…
if I have family there do I still need visa to live with them?
AFAIK if you have a grandparent who is an Irish citizen and was born there, you can get an Irish citizenship. That is automatically an EU citizenship, and if you have that you can live and work anywhere in the EU without needing any sort of permit.
But even if you have this Irish grandparent, you can't just move into a EU country and live there BEFORE getting an official document saying you are now an Irish citizen.