No siblings.
My DH talks to his sister via text maybe a few times per month. Phone - extremely rare. We see her maybe 1 or 2 times per year.
My parents have both been estranged from their siblings are various points. My dad now talks to his siblings probably weekly (not all of them but at least one of them). My mom sees her sister maybe once per year, and they do not talk (the children arrange gatherings and they show up).
I am an only with an only. Whenever I question whether or not I am sad about not giving my child the "gift" of a sibling, I take stock of the closeness and joy some people feel as a result of sibling relationships, as well as the ambivalence, and also the hardship and grief and complications that sibling relationships cause. It's a total wash, and I am not regretful.