It became a family affair for the golfing Thorpe brothers, Jim and Chuck, of Northern Virginia today as they led the way after the second round of the Mid-Atlantic Open at Hobbits Glen and All View. Both played at All View and Jim had another 69 for a six-under-par 138, a stroke better than Chuck, who shot 68.

Both Thorpes, who joke that they "play out of the back of our car trucks" have played the big tour. Jim, 28, the younger of the brothers by two years, is from Falls Church and Chuck is from Alexandria. Neither has a club affiliation at the moment and both plan to rejoin the tour in the fall.

Four tied at 140, including amateur Jack Skilling, 16-year-old wunderkind from Chevy Chase who had 67 over the tougher Hobbits Glen course; Wayne McGowan, Cedar Crest; Glenn Brown, Belle Haven, and Mark Walach, Laytonsville.

The final 18 holes of the tournament will be played at Hobbits Glen Wednesday. A total of 74 pros made the cut at 151 and 35 amateurs at 157.

Jim Thorpe was out in par 36 and back in 33. He bogeyed the first hole, missing the green, and also bogeyed the fourth by three-putting. He missed a four footer on the 16th for his third bogey.

He had six birdies.He chipped within inches of the cup on the third hole; sank an eight footer on the ninth; a 20 footer on the tenth; chipped close again on the 12th; ran in a 15 footer on the 14th, and made a three footer on the 18th.

Chuck, who won this tournament in 1970 and has finished first in five of 11 tournaments on the United Golf Association tour this year was unhappy with his round.

"I had too many three-putt greens," he explained, "and I missed a birdie on the 17th when I three-putted. I'm hitting the ball well but I just can't get those putts to drop."

Skilling, one of the top junior players in the area, had six birdies and one bogey. His putting was phenomenal. He was dropping them in from considerable distance and required only 27 putts. He hit 14 greens.

Bill Bassler, Jr, an amateur partner Paul Celano of Rolling Road won the two-man scratch title in a playoff after posting 213.Jim Hayes and Chuck Benton, Holly Hills, was second and Mark Diley and Butch Mielke, University of Maryland finished third.