We've had our difficulties over the years (after mom died, it was a looong nightmare)....but the past two or three years, everyone has gotten along extremely well..even dad and me. It's not a typical father-son relationship, but we're closer right now that we've been since mom died.
I now tell dad I love him before hanging up the phone, and sometimes he says it back
As for my sisters and I, we just seem to get closer. I miss Becky and those three kids so much it hurts. One week or ten days together every 1-2 years isn't nearly enough. I email her nearly every day just to tell her I love her, and how proud I am of her; send her and the kids cards weekly just to say hi!, love you, or miss you
I emailed Nick yesterday to wish him luck in his baseball game; call Maddie to hear her sweet little voice describing her latest school project, dance recital, ski lessons, or just to tell me she loves me. I'm the same way with Becky...just hearing her sweet voice brightens my day
Beth and me are closer than ever. She calls me for advice, seems to trust my judgement more than dad or Pat's (which is very good since I'm more level headed than either of them

-- but she knows I'll never steer her wrong. I also make sure Beth knows how proud I am of her, and anytime she needs me, I'm there for her.
Maria may be a stepsister, but she was only six when dad and her mother married, so we're close as well; closer than many brothers and sisters...I'll call her to make sure she's okay, and let her know when storms are coming (they are still in a mobile home - I'll be so very thankful when their new home is finally finished). I worry myself sick about her and Chris during tornado watches -- Maria is terrified of severe storms to begin with..so is Becky (but Beth and me enjoy them...have even thought about chasing tornadoes together
It isn't perfect (my stepbrother and me very rarely see each other -- but when we meet, it's cordial), but overall I feel very blessed.