AITF's back door episode for Maude's spin off was the last interaction between Archie and Edith and Maude's family.
But not a single episode of Maude had any mention of the Bunkers.It's almost as if their connection never even existed.
I can understand Archie never being welcome there,since he and Maude couldn't stand eachother.But Maude loved Edith and thought the world of Edith.:confused:

Hmmmmm I would like to see that one! (The spinoff show)

It is striking how quickly the connection was severed, especially since Maude Findlay was introduced specifically as Edith Bunker's favorite cousin. While they were established as extremely close in their two All in the Family appearances, the lack of crossover or even verbal mentions on Maude can be attributed to a few behind-the-scenes and narrative reasons:

Creative Independence: Producers Norman Lear and Bud Yorkin wanted Maude to stand on its own as a topical sitcom rather than being a constant extension of the Bunkers' world. By keeping the shows separate, Maude could explore its own upper-middle-class liberal environment without being anchored to the working-class dynamics of Queens.

Network Strategy: This was a common trend in 1970s spinoffs. For instance, when Good Times spun off from Maude, the writers changed Florida Evans' back-history and location entirely, and Maude was never mentioned again on that show either.

Geographical Distance: In-universe, Maude lived in Tuckahoe, New York, while the Bunkers were in Queens. While not an impossible distance, it provided a narrative excuse for them to exist in separate "bubbles".

Character Conflict: As you noted, the mutual dislike between Archie and Maude was legendary. While Maude loved Edith, the writers likely felt that bringing up the Bunkers would inevitably lead back to Archie's conservative views, which would clash with the specific feminist and liberal tone they were cultivating for Maude's series.

It is striking how quickly the connection was severed, especially since Maude Findlay was introduced specifically as Edith Bunker's favorite cousin. While they were established as extremely close in their two All in the Family appearances, the lack of crossover or even verbal mentions on Maude can be attributed to a few behind-the-scenes and narrative reasons:

Creative Independence: Producers Norman Lear and Bud Yorkin wanted Maude to stand on its own as a topical sitcom rather than being a constant extension of the Bunkers' world. By keeping the shows separate, Maude could explore its own upper-middle-class liberal environment without being anchored to the working-class dynamics of Queens.

Network Strategy: This was a common trend in 1970s spinoffs. For instance, when Good Times spun off from Maude, the writers changed Florida Evans' back-history and location entirely, and Maude was never mentioned again on that show either.

Geographical Distance: In-universe, Maude lived in Tuckahoe, New York, while the Bunkers were in Queens. While not an impossible distance, it provided a narrative excuse for them to exist in separate "bubbles".

Character Conflict: As you noted, the mutual dislike between Archie and Maude was legendary. While Maude loved Edith, the writers likely felt that bringing up the Bunkers would inevitably lead back to Archie's conservative views, which would clash with the specific feminist and liberal tone they were cultivating for Maude's series.

Now that I think about that is true the Bunkers were never referred to again on the show and no one from Maude appeared on AITF. The Jeffersons did mention the Bunkers in later seasons and even returned for a visit in the last season.