He was willing to spend the rest of his life in jail for his son.

and Covered for Nathan over Dante's Death

I didn't pick covering for Nathan because I think he felt guilty about killing Keith and thought he should be in jail, and if it wasn't for killing Keith, than it might as well be to help his son avoid jail.

i never saw season 1 so i have no idea how he saved Lucas' life...someone send me a message explaining it?

the covered for nathan after Dante's death thing was more guilt then caring, he wanted to pay for what he did so i picked this one, cause in this case he fully cared.

My top picks are saving Jamie, saving Lucas' life, and covering for Nathan.
When Dan was covering for Nathan, his key reason for doing so was guilt, believing he should be the one spending the rest of his life in prison.
His intentions for saving Jamie was only to keep Jamie safe. Same with saving Lucas, he left his bitterness aside so he could save him. But I picked Dan saving Jamie because that moment bonded them together. Jamie began to love and trust Dan afterwards.

^^ And that's supposed to be a good thing? Dan killed his brother in cold blood. How is it good for Jamie to bond with him? Also, I wanted to say that I would not word this question this way. Dan didn't do any of these things to be nice. Yes he saved Lucas but what was he supposed to do? Nothing? Same with Jamie. And I've already mentioned why he covered for Nathan, it's the same reason he wanted to support Karen and her baby. He felt guilty about killing Keith and leaving his child to grow up without a father.

What you just said i have to agree with you 100 percent as he did do it over guilt...

When i said nicest thing, i was using the term as loosely as i could considering it was Dan Scott we were talking about

Those to things that he did really suprused me. He used to never be their for his family and then, he saed he's son and his Grandson!! 2 is always better then 1 right? But saving Lucad was pretty schoking to me since back then, he didnt care atall about him !

Wow, Dan...