Perpetual Residuals
Interesting stories coming out due to the new movie.
Apparently Desi Arnaz felt so bad for having to let Frawley go from My Three Sons he wrote a clause into his release granting him residuals "in perpetuity". As long as I Love Lucy & My Three Sons are airing, he (or his estate) will receive royalties. Even now almost sixty years after his death, he's still making money. Even Desi & Lucille Ball's residuals have expired.
Since the new movie is using Frawley's image and likeness, his estate will be paid.
PS: Because Lucy and Desi Arnaz Jr. are Executive Producers on the project they're probably still receiving a bundle for it.