I'm confused. Are you saying his daughters weren't in it? Or are you referring to someone other than Black Lightning's actual daughters somehow that I don't understand? Or are you just going off of that trailer? Because his daughters were definitely in it, and were a pretty big part of the story. They're also shown in the trailer, although it might be easy to miss them.
I rolled my eyes a ton in the first half of the show, and a little bit in the last half, and really hated the daughters at first, but overall it wasn't as bad as I was thinking it was going to be. I actually really like the main actor now that I've seen more of him, and Dexter's dad is always great. It had, to my mind, far too much blatant "this is a black show" stuff, and typical stupid white racist cops that might happen in real life but everyone agrees is dumb when it does, but once it got past some of that stuff I liked it ok. I mean, we have the typical shit where how am I supposed to believe that his own daughters wouldn't recognize him in his suit and goggles, particularly since there can't be too many huge black dudes with that particular strikingly cut beard in this town, but whatever.
I will keep watching, as it was better than I expected it to be. Not great, and it could tip into unwatchable territory very easily, but it earned further viewing from me on the strength of the main actor mostly.