Bobby Orr, far from proper condition and with groin muscles aching, is doubtful starter for the Chicago Centre. Hockey fans are sure to see somthing almost as rare as the brilliant so 4, however.

Skating on left wing for the Washington Capitals will be 20-years-old Paul Mulvey, 6-foot-4 and 212 pounds. On right wing for the Hawks will be 22-year-old brother Grant Mulvey, 6-4 and 200. If they collide, the noise might be heard in Merritt, British Columbia.

That is where the Mulveys' parents will be spending the night, after watching rookie Paul score his second goal in three NHL games during Saturday's 6-3 loss here to Atlanta.

"They couldn't stay for this one," Paul Mulvey said. "Mom's got a weak heart. She couldn't take it.

"I've been thinking about it all summer. We played against each other last one time, when I was 14, and I only played one or two shifts.

"We talked on Sunday and we're both proud of each other. He hasn't scored, so I zinged him a little bit about my two goals. I hope I can get on his case tomorrow, too.

"We played a lot this summer, with some other pros, and he reminded me about the three goals he got against Washington last year. He'd wind up to shoot and he'd say, 'Here's Grant Mulvey winding up, he shoots Bedard goes down it's a goal.'"

The brothers have a reputation for fighting, with Grant collecting 135 penalty minutes in the NHL last year and Paul serving 262 in junior hockey for a four-year total of 1,023. Nevertheless, Paul offered little likelihood of fraternal fisticuffs.

"I think that would be the ultimate disgrace, two brothers fighting," he said. "I'll hit him as hard as I hit anyone. We'll both play our game. But I gon't play the game that goony, that I'd swing at my brother.

"We never fought as kids, either. My dad's strict disciplinarian. And Grant left home at 15 and I left at 14. I think that's when you start fighting."

Although Paul admires his brothers, who is in his fifth NHL season after becoming an underage draft in 1974, Grant's success has given Paul a stimulus.

"A lot of people back home were saying I was only playing junior because of Grant," Paul said. "They said I couldn't make it to the NHL. Well, this summer I worked hard, ran and lifted weights every day, and once I got used to camp I left I could play in this league."

Coach Danny Belisle has reunited Bob Girard, Guy Charron and Bob Sirois. Tom Rowe will team with Mulvey and Greg Carroll . . . Robert Picard and Bryan Watson are paired on defense, as they were last year. Yvon Labre will play with Pete Scamurra . . . Ryan Walter skated yesterday and could be in action within a week, if worked out here, but there was no progress in talks designed to make him a Capital.