I listened to every opening and ending of The Sibs (1991) I could find online and pulled the best versions I could. It turns out there are two slightly different versions of the thirty second ending. Unfortunately I couldn’t find a high quality version of the one minute opening (although I don’t think it is using much different material from the thirty second version). It would be cool if there were a full length version like 1:40 The Tracey Ullman Show Theme Song.
Also interesting, there was an audio transition around the very end of episode 17 that sounded just like (She’s Got It) Goin’ On.