Although the Democratic National Convention next month will mark the first such gathering since 1944 in which no one from the Kennedy family is serving in Congress or the White House, about two-dozen members of the clan are expected to travel to Charlotte, N.C., according to a person who is familiar with their plans.

Caroline Kennedy and Ethel Kennedy are scheduled to attend, as well as the late Senator Edward Kennedy’s sons, Ted Jr. and Patrick, the former Rhode Island congressman.

Joseph Kennedy III, who is running to succeed Representative Barney Frank, also will make the trip to Charlotte and introduce a video tribute to the late senator on the night of Sept. 4, when the convention opens. Senator Kennedy, a longtime champion of health care reform, died in August 2009 after a battle with brain cancer.

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Joseph Kennedy is expected to return to Massachusetts shortly afterward to resume campaigning. The candidate’s father, former Massachusetts congressman Joseph Kennedy II, also is scheduled to attend the tribute, said the family friend, who asked to not be identified.

The convention’s opening day will include a reception by the Edward M. Kennedy Institute for the United States Senate, which is being built at the University of Massachusetts Boston. The reception will be hosted by Vicki Kennedy, the senator’s widow.

BRIAN MacQUARRIE