SHOWS FOR YOUNGSTERS AND THEIR PARENTS TOO : Family Whys on KCOP; Physical education on CBS; Final season for Avonlea on Disney.

Why does it rain? Why do we sneeze? Why? Why? Why? Welcome to The Why Why Family, which premieres on KCOP Sunday at 7 a.m. In this animated series, the center of attention is Baby Victor, a crawling question mark who is curious about everything. His family tries to find answers. In Sunday’s episode, Mom takes to the skies to find out why birds fly. For ages 2 to 11.

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Avonlea, which follows the adventures of the townspeople in the village of Avonlea during the early part of the 20th Century, enters its seventh and final season on the Disney Channel. In Sunday’s episode, “Davey and the Mermaid,” at 9 p.m., Davey (Kyle Labine) is infatuated with a mermaid in a traveling carnival. For the family.

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For those who might have missed the premiere of 7th Heaven, the family drama exploring the life of the Camdens, the pilot airs again Monday at 8 p.m. on WB. Father Eric tries to stop Matt, 16, from smoking, Fourteen-year-old athlete Mary asks Matt for advice on kissing boys, while Lucy, 12, is on the verge of womanhood and Simon, 11, prays for a dog. For the family.

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Designed to encourage physical wellness among America’s youths through sports, PE-TV premieres on KCBS Saturday at 6:30 a.m. The show promotes the benefits of sports by featuring major athletes and celebrities. The first episode includes NBA stars Nick Van Exel, Olympic basketball star Rebecca Lobo, actor Jonathan Silverman from “The Single Guy” and the vocal group SWV. For ages 6 to 17.

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All Dogs Go to Heaven: The Series starts barking on KTLA, Saturday at 7 a.m. Based on the two movie musicals of the same name, the animated series follows the adventures of two of heaven’s guardian angel dogs, Charlie Barkin, a roguish German Shepherd, and his sidekick Itchy Itchiford, a Dachshund. In the premiere, Charlie is threatened with the arrival of an almost perfect guardian angel dog. For ages 2 to 11.