TUB OSMOND BROTHERS made their very first night-dob appearance, last night, when they opened a three-week engagement In the Venetian Room of tha Fairmont Hotel. They are accompanied by their father, Georg® Osmond, theiryoungest brother, Danny, who Is now seven, and by their tutor. The Osmond Brothers of Ogden, Utah, {Alan, 15, Wayne, IS, Merrill, 11 and Jay, 9), have captured the hearts of everyone who has seen them on the Andy Williams TV Show, and from the look of things, it's going to keep right on happening for years and years to come ... Phil Lehr has a new dish at'his downtown Steakery In San Francisco that’s becoming quite a fa-_ _ vorite — Steak and Lobster Half and Half._ _ . Each complements the taste of the other andAJaa Osmona ^ ^ ^ lt;jjnner treat . . .