Family reunions for me means visiting my sister but I talk with her everyday on Skype even though she lives 2000 km away. We have not heard from my cousins on my Father's side since Mum died in 2006 (Dad died in 1974). The eldest use to send her a card at Christmas but did not reply to our message that she had died, not even a sympathy card.
My sister rings one cousin on my mother's side every few weeks. She has mild dementia and is in a home so the conversation is limited. Until 18 months ago, my sister was trying to care for her, managing her affairs, she would not let her daughter near her, and it was really too much for my sister.
A nephew (slightly younger than me) flew down from Queensland and took her up to live in a home near him. He had to tidy up her affairs and the small unit where she lived. She was his mother's sister so a closer relation than us. My sister and I took him to lunch (Good Friday) and it was the first we had met since we were teenagers. His mother and mine rang every week but both are now dead. However, once he had taken over her financial affairs from my sister, he has not made any contact with us again.
Sadly for me, Sister excepted, blood is not thicker than water.