That is the question. There's alot of speculation & it's been brewing for a while so this should be fun in the weeks & months to come. Watching this guy today, I saw an awful lot of Sonny in more than just the dark soulful eyes & dimples. His mannerisms were very Sonny & his reverence for moms & children. Just in the brief time he was on today, I became more & more sure he's Sonny's kid, whether or not he's really Dante. But, the line that sold it for me was, "Thanks for the bullet, Claudia. I can't wait to repay the favor." That was classic Sonny, especially with the wiseass smile.
If this guy is Dante, I feel very sorry for Liv in one way. She was crazy about Sonny when she was a kid. She let her cousin have him & led them both to believe it was because Sonny was more interested in Connie. In reality, it was to protect her son from that life. She did without the guy she loved (she lucked out there) & all the benefits of being his wife (jewels, money, her own island) to keep her kid out of the mob, all for nothing. It's going to be even worse for her because now she knows that Sonny would never let his kids into the biz.
Since Dominic said he was from Bensonhurst, any woman could be his mother & Sonny could be his father, or it could be a red herring.
The other possibility ties in with another story. Early in Kate & Sonny's courtship, it was said that they didn't have sex back in the day. But, since we all know the writers love to rewrite history, or may have forgotten that, we can't discount the possibility that Dominic is Connie Falconeri's son with Sonny. That could be Kate's deep, dark secret that Gisele is blackmailing her about. It could also be why Kate pushed Liv so hard to tell Sonny the truth about Dante. To keep Sonny too busy to look too deeply into what she was doing between when she left Bensonhurst & when she hooked up with Trevor. Perhaps Trevor even knew. Maybe Kate had Sonny's baby & gave him away & that baby is Dominic. It could've even been an open adoption & he knows she's his mother. Maybe he's the secret investor in the magazine?
In any case, I like him so far, if only because he could've killed Carly & the boys & he didn't. It isn't much, but on that show, it was actually a big thing. They've gotten to the point with the violence level that not killing a woman & 2 children is a sign of a gangster with a heart.