she was in the ep THE RETURN OF HUGHIE HOGG

and her name was Hortense

Up until that ep the only sister he talked about was Lulu

Hortense? That's kind of a strange name

Hortense was one of those family members that showed up once and were never heard from or spoken about again ('course then again, Coy and Vance were never mentioned after they left either...). The strange thing about Hortense is that Boss refers to her as Lulu's sister, but it is never mentioned that it would also make her Rosco's sister, in fact in the scenes that she is in with Rosco, you can't tell that they are even related!

Family members (from most of the main families in Hazzard) would appear once or twice, but would not be talked about in any other episode. Examples: B.B. Davenport, L.B. Davenport, Nancy (Cooter's daughter), Hortense, Abraham Lincoln Hogg, Jeb Stuart Duke, the Comfurts, Aunt Clara, even Hughie Hogg.

I can understand not bringing them back in for other episodes, but an occasional mention would be nice...

Unfortunately, continuity of this kind was rare on the Dukes, there are very few episodes where there is even a reference to a previous episode. Though I suspect that this is part of what makes it easy to broadcast the series 20+ years later...it still seems like a "fresh" series, since there are very few things that date the series, and because they don't reference other events, you don't feel lost if you view one episode without seeing the others...

LS3

I remember, wasn't there a Dewey Hogg & Silas Hogg?

Yup there sure was.

Funny how those characters disappear huh?

It would be nice if there was some mention...like a phone call even (Phoney one of course but one nonetheless.)

I got the feeling that maybe Hortense and Rosco don't get along. Probably why Rosco avoided talking to her in the episode.