Q. Tell me, counting only each new season, what are the top 10 longest running sitcoms to date, and the years they ran. - J.A., St. Joseph, Mo.

A. There are 11 shows in the list unless you discount "The Jeffersons" and "Happy Days," which started in January. "The Danny Thomas Show," '53-65 and '70-71; "All in the Family/Archie Bunker's Place," '71-83; "My Three Sons," '60-72; "M.A.S.H.," '72-83; "Happy Days," '73-84; "The Jeffersons," '75-85; "Facts of Life," '79-88; "Father Knows Best," '54-63; "The Beverly Hillbillies," '62-71; "Alice," '76-85. "Cheers," now in its ninth season, will join the elite after this season.Q. Does Danny Thomas have any other children than daughter Marlo? Is she Phil Donahue's first wife? If not who was? - C.R.C., Detroit.

A. Danny and wife Rose Marie have three children. Son Tony is the man in the middle in the successful production team Witt/Thomas/Harris, whose shows include "Soap" and "The Golden Girls." Younger daughter Teresa had a brief singing career. Donahue was married to the former Marge Cooney, 1958-75. Donahue and Thomas were married in 1980.

Q. Have looked for years for data on Faye Emerson, who was on TV 20 years ago. She was married to one of President Roosevelt's sons and to Skitch Henderson. - Mrs. R.H.C., Philadelphia.

A. Emerson was a minor movie actress when she married Elliot Roosevelt in 1944 and turned into an Eastern socialite. She started in TV in New York in 1948 became a leading personality on talk and panels shows, known for her wit and her plunging necklines. She married Henderson in the 1950s after her divorce from Roosevelt, divorced Henderson in 1957. By 1963 she was out of TV and went to Europe and never returned to the U.S. She declined TV and stage offers, lived in retirement in Majorca until her death at 66 in 1983.

Q. Where do I send my tapes to "America's Funniest Videos"? - L.B., Detroit.

A. Vin Di Bono Productions. Box 4333, Hollywood, Calif. 90078. Include a $3 handling fee if you want the tape returned. The address for the "Videos" spin-off, "America's Funniest People," is the same.

Q. How old is Tom Selleck and what is his birthday? When will he do another "Magnum, P.I." special? - S.F., Acworth, Ga.

A. Selleck is 45, born Jan. 29, 1945. Although his feature film career has sputtered, he isn't likely to return to TV any time soon, as Magnum or any one else.

Q. Often I hear about "ratings families." How do I become a ratings family? - F.T.S., Tucson, Ariz.

A. You have to be asked by a ratings service, usually the A.C. Nielsen Co., the top service in measuring TV viewing. Ratings families must be typical of certain demographic characteristics: age, education, geographic location, etc. Since just over a thousand households are used in the national sample, it's a long-shot that you'd ever be picked.

Q. Who is John Goodman, of "Roseanne," married to? Is she an actress? - M.L., Winnipeg, Manitoba, Canada.

A. Goodman, 38, married college student Annabeth Hartzog, 22, in 1989. They became parents of Molly Aug. 31.

Q. Where can I write to the producer of "Full House"? - B.H., Buffalo, N.Y.

A. Jeff Franklin is creator and one of the executive producers of the series. Write Franklin at Lorimar Telepictures, 10202 W. Washington Blvd., Culver City, Calif. 90232.

Q. I have seen Claude Akins in commercials and numerous TV series and movies. How long has he been in show business? - K.P., Woodmont, Conn.

A. Akins started on stage in the late 1940s, made his Broadway debut in "The Rose Tattoo" in 1951 and his movie debut in "From Here to Eternity" in 1953.

Q. I've bet my sister that an actress has played Mrs. Columbo. - F.W., Romulus, Mich.

A. Kate Mulgrew was Kate Columbo but not on the Peter Falk series, where "the missus" has never been seen. The 1980 show started as "Kate Columbo," was retitled "Kate the Detective," then "Kate Loves a Mystery," and Kate was renamed Callahan.

Q. I like Timothy Busfield, of "Thirtysomething." He was in "Trapper John, M.D." and "Family Ties." What else has he done? - L.H., Charlotte, N.C.

A. Busfield doesn't list "Ties" among his credits. He was a regular on the summer series "Reggie" and did guest roles on "Paper Chase."