Hi! Metro Scene is back, carrying the freshest political news from out west about a man who would like to come to Washington and be the third generation in his family, following his grandfather and father, in Congress.

Rep. Joseph R. Knowland (R-Calif.) served from 1905 to 1913. His son, Sen. William F. Knowland (R-Calif.) served from 1945 to 1959, including stints as both minority and majority leader of the Senate.

Now Joseph W. Knowland, 55, who followed both forebears as publisher of the then- family-owned Oakland Tribune, is one of a dozen in the running for the GOP nomination for the Senate in Tuesday's California primary.

He knows he's going to win, Knowland told an interviewer for the San Francisco Examiner: "It's in me; it's part of the heritage taught me since childhood."

But, if the truth be acknowledged, this may be the last time you'll read here about Joe Knowland.

As one of a dozen aspirants on the ballot, he shows up in the polls among the 1 to 2 percent of straw votes for also-rans.

Which seems to prove that politics is a family- communicable affliction against which truth is no serum. Geography Lesson

On occasion, in newspapers remote from the regions in question, I've read of events in Upstate, N.Y., and Downstate, Ill., as though the vastnesses of Upstate New York and Downstate Illinois were communities.

The other day, in the published version of Washington correspondent Carl Cannon's dispatch about television evangelist Pat Robertson's potential presidential campaign, the San Jose (Calif.) Mercury News produced a reference to Robertson's "Tidewater, Va., broadcasting center."

Tidewater Virginia, of course, is not a place but a region. One hardly expects such a reference from one of the best newspapers in Northern, Calif. Punctuation Lesson

On my arrival the other day at National Airport, one of the first things that came into view was a series of posted notices each addressed to:

CUSTOMER'S

The notice's told customer's that price's for parking automobile's in airport parking lot's had gone up on May 1. Why do so many writer's of notice's include apostrophe's on plural noun's where punctuation mark's are redundancie's?

Question's, question's! Safety Lesson

Back on the Metro subway, I witnessed what could have had a sad ending yesterday, mainly because the mother of a young child tried to get aboard a train after the operator rang the ding-dong warning bell that the doors were about to close.

It happened at the Farragut West station. The mother, apparently believing the car door would bounce back open like on an elevator, pushed the tot ahead and the door clamped her neck and shoulders.

Passengers wrenched the screaming child loose without injury, but she was appropriately terrified.

Metro intentionally designed the doors without sensitive bounce-back edges so late arrivals couldn't delay train service. A word to the wise: Once you hear the ding-dong, step back and wait for the next train.