Brian Alan Lighthall, aged 5, the only member of his immediate family to survive a head-on automobile collision in Gaithersburg on Sunday night, was listed in satisfactory condition yesterday at Johns Hopkins University Hospital in Baltimore.

The boy's father, Alan Donald Lighthall; his mother, Jana Lynn Lighthall; and 8-month-old sister Rebecca Lynn Lighthall, died shortly after the 6:45 p.m. head-on collision on Gaithersburg-Laytonsville Road. Nathan Lighthall, his 4-year-old brother, died at Johns Hopkins Hospital early Monday, police said.

According to a hospital spokesman, Brian Lighthall suffered two broken femurs (thigh bones) in the accident that killed four members of his family when an oncoming car crossed the center line of the road after failing to negotiate a right-hand curve and collided head-on with the Lighthall's car.

Police said the driver of the other car, a 16-year-old Gaithersburg youth, is in stable condition at Montgomery General Hospital, suffering from a broken leg.

A friend of the Lighthalls, Susan Cobb, described the family as "the type of people you would love to have as neighbors.

"They were very soft-spoken, very gentle, always there assisting others. Jana was always helping people, bringing over a loaf of bread or something, babysitting . . . " Cobb said.

Alan Donald Lighthall, 31, was a U.S. Army Captain and a medical officer at Walter Reed Medical Center. The Ogden, Utah, native attended public schools in that state, and earned his undergraduate degree in history from Brigham Young University, where he was a member of ROTC.

Mrs. Lighthall also attended BYU, gaining a degree in clothing and textiles in 1976. The Lighthalls, who were married in 1975, spent 3 1/2 years in Landstuhl, Germany, at the U.S. Army Medical Center.

In Gaithersburg, Mrs. Lighthall served as president of the Women's Relief Society, an organization of women affiliated with the Church of Jesus Christ of Latter-day Saints.

Friends said an Educational Memorial Fund has been established for Brian Lighthall and that contributions could be sent to the fund care of William Carlson, 8500 Goshen View Dr., Gaithersburg, 20879.