Funny, I have a bro in the UK, a nephew & niece, a few cousins etc. Mom & Dad are both gone now.
I hear from my bro very occasionally, my nephew recently got me to install a messaging app on my phone so he & I can communicate a little more. He's an IT security guy & considers e-mail too formal! I hear from both of them if they have family woes or want advice (which is nice I guess) but then I may have to tread on eggshells! lol I never hear from my niece. Cousins? maybe, around Christmas time after we send out cards.
We're not on Facebook, Twitter, Social etc etc so we are not constantly in touch & we can't be pestered with a lot of trivia, etc. We (my wife & I) find that much of what is now classed as "news" is so ridiculous that it's not worth reading most of the time! But many younger people seem so wrapped up in that stuff & need to know instantly if X is seeing Y or who has unfriended whom.... etc etc ad nauseum.
I do think people get wrapped up in their own little worlds, & forget about those that are not constantly (or directly) involved in their daily lives. I don't believe there is any malicious intent, it's just that we're not "in" their lives.
I never hear from my ex's family, I used to keep in touch but over time I guess we meant less & less to each other, & were thought about less & less (& it's a two way street, not blaming "them" at all) I think we all move on & operate in our own spheres & have our own interests, just because we're "related" or were related to someone doesn't (to me anyway) mean we have the same interests, hobbies, lifestyles or even like each other.
As that old adage goes "you can pick your friends but you can't pick your family!"