Whatever happened (in alphabetical order) to Alton, Babs, Estelle, Frank, Helen, Morty and Uncle Leo?

They all appeared briefly on Seinfeld, "the show about nothing" http://digbig.com/4xqyq, sometimes as briefly as in one or two episodes and got their share of 15 minutes of fame. Alton Benes, war veteran and celebrated author in the Hemingway mold was the father of Elaine Benes http://digbig.com/4xqyp. Elaine appropriately enough worked as a manuscript reader and editor with various New York publishers. Alton terrorised Jerry, "the funny guy", and "gay" George, in the lobby of a venerable downtown hotel "for people who like leather couches and leather patches on their elbows". He also contributed to the utter ruin of Jerry's new and horrendously expensive soft suede jacket by refusing to take a cab to reach the Pakistani restaurant five blocks away from his hotel although it had started to snow by the time Elaine joined them. Babs, Kramer's mom, finally revealed to us his first name, Cosmo, which he had been refusing to divulge all along. She, an ex-alcoholic, was also caught in a heavy petting session with Jerry's nemesis, Newman. Estelle and Frank made the life of their son, George, a living hell. Estelle read his mail routinely because "I'm curious" and castigated him for "treating his body like an amusement park". Frank could never get over the perversity of a rooster having sex with all the chickens in the roost. Helen, Jerry's adoring mom, was always wondering how anybody could not like her son. She was also a severe critic of the dress sense of her husband, Morty. He was something of a wimp and a damp squib although he was into the Florida condo politics in a big way. He was the only parent who called Kramer "Mr Kramer" while Kramer slapped him on the back and called him Morty. Finally, an honourable mention for Uncle Leo who held Jerry's elbow every time he could corner him and waxed eloquent about the newest achievements of his son Jeffrey who worked for the Parks Department "like he split the atom" in Jerry's own words.
Take a bow, Larry Richards and Jerry Seinfeld.