how to start a relationship with your stepfather?

If you and he are close, pull him to the side one day and just ask him. More than likely he'll say yes, then make sure you announce the results to your family. If he says no, then at least you tried. Also try to ask him why he doesn't include you in doing things with his other son. You didn't really say why he doesn't, but it won't hurt to ask to do things too. Just don't be afraid, go ask!

I would go at this problem through your mother. Talk to your mom about how you would like to be closer to her husband. She can get things moving on your step father's end. Wait a few days/weeks, and then ask your step father if you can hang out or do something fun.

After you have built a relationship you can just start calling him Dad--or you may come up with a different nick name for him that better explains your relationship with him.

I would talk with your Mom first. in ask her what does she think your step dad would say if you were to ask him about you calling him Dad in stead of his Name. I'm thinking she would be able to give you the answer, He may not no that you are wanting to call him Dad, he may even Love the ideal of it.I no i would for I have a step son that calls me Dad, and really i would not have it any other way, for if it makes him feel good I feel good too. So talk with Mom first, are if you in your Step Dad are close I think he would be Happy to talk to you about it. I'm thinking he is a pretty good Guy for you to want to call him Dad, So i think you could very easy talk to him, and ask him if it would be alright for you to call him Dad in stead of his name. Good Luck on what ever you decide.

You ask respectfully, "May I call you Dad?" It would mean a lot to me because I've never had a Dad

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just one day let it "slip" out and see his reaction if its one of anger stop if its not then let it gradually slip out more and more and eventually not even denie it and call him dad

Ask him. I bet he would not mind.