Had anyone asked Diamante Yakavetta, she would have told you that her brother was a fuck up -- that there was no way he could handle the pressures that came with running the family. Had anyone asked, she would have given them several people better suited to the job, including herself. But, of course, no one did. And look where it got them.
She's not letting them make that mistake again. This time...she's not waiting for them to ask. No. This time, she's simply telling them. This time she's in charge and she will see the Yakavetta family restored to its former glory.
And well...if she happens to destroy the MacManus family in the process? That's just a nice little added bonus.