I'm really close to my mom - she lives thousands of kms away, so I only get to see her maybe four or five times a year, but we stay close over the phone and stuff. My step-dad, who lives with my mom, is okay - I can tolerate him, but there's really absolutely no relationship between us other than politeness and small talk - I strongly disagree with a lot of his behaviour, with the way he chose to raise his children and the way he relates to them now, and with his politics, so I don't think I could ever be remotely close with him. Despise his kids, my step-siblings, and try to have as little contact with them as possible.
I am estranged from my sperm-donor, who was very emotionally/verbally abusive to me growing up (when he actually remembered I existed; otherwise he was ignoring me completely), and very emotionally/verbally/physically abusive to my mother, in front of me, no less - he left when I was 11, good riddance. I will never, ever speak to him again.
Very sporadic contact with my father's father (his mother is dead) - I write to him occasionally (he lives quite far away), but he's an alcoholic, and also abusive (never has been to me, but that's because I've spent barely any time with him in my life), so I wouldn't dream of spending time with him. Will never, ever have any contact with my father's brother, who IMO is a POS (for example, he offered my mother an exorbitant amount of money to divorce my father and not have any further contact with him, or bother him to have any further contact with me, either, when I was a baby - nice, eh?).
Sporadic contact with my maternal grandmother - was totally estranged from her for five or six years before she re-initiated contact. No contact at all with my maternal grandfather or the rest of my maternal family (aunts, uncles, cousins) - they are the most negative, miserable, angry, mean people I have ever known, and I just do not need that kind of energy in my life.