Are both of these perfectly natural?
1) I know that things might still be a little difficult for you because of what happened to your dad, but that's really no excuse to behave like that.
2) I know that you're probably still going through a difficult time because of what happened to your dad, but that's really no excuse to behave like that.
Yes, they are both natural. That being said, the tone of "no excuse" sounds disciplinarily harsh.
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Yes, they are both natural. That being said, the tone of "no excuse" sounds disciplinarily harsh.