From Wikipedia:
The New Leave It to Beaver (also known as Still the Beaver) is an American sitcom sequel to the 1950s and '60s series, Leave It to Beaver. The New Leave It To Beaver began with the 1983 CBS TV movie Still the Beaver, and was picked up in 1984 as a Disney Channel series with the same name; however, it only lasted one season. It was then picked up by TBS in 1986 and renamed The New Leave It to Beaver. The series, also syndicated in the late 1980s, lasted until 1989.
It is one of the rare examples of a television series revival sequel (not spin-off) that revolves around the characters from the original series. Other examples of this would be The Brady Brides (and later The Bradys) and What's Happening Now!! The New Leave It to Beaver is the longest running and most successful of any series revival in television history.
The series focused on Wally Cleaver (Tony Dow) and his younger brother, Theodore "Beaver" Cleaver (Jerry Mathers) all grown up, with families of their own. Theodore is divorced and living with his mother, the widowed June Cleaver (Barbara Billingsley), along with his two sons, Kip and Oliver. Wally lives next door with his wife and daughter Kelly and, later, son Kevin joins the brood.
Other series regulars included Wally's old friend Eddie Haskell (Ken Osmond) and his family, along with "Lumpy" Rutherford (Frank Bank).