ATLANTA (AP) — For years, they were the picture of solidarity: the four children of Martin Luther King Jr. carrying on the legacy of the civil rights icon.

But a lawsuit over how their father’s estate is being run has left a rift in one of the world’s most famous families. And it may now be up to a judge to get the King children in the same room.

‘‘Strong parents have strong children, and strong children have strong opinions, and that usually leads to conflicts that they have difficulty reconciling,’’ said Andrew Young, the former Congressman and Atlanta mayor who worked alongside Martin Luther King Jr. during the civil rights movement and remains close to the family.

The lawsuit filed July 10 claims that Dexter King, administrator of his father’s estate, has failed to provide his surviving siblings with essential documents, including financial records and contracts.

It claims that he and the estate ‘‘converted substantial funds from the estate’s financial account … for their own use’’ on June 20 without notifying his sister and brother. It is not about money, but instead is a last-resort effort to talk to Dexter King about the family’s affairs, even if it’s through a judge, Young said.

‘‘It’s simply a matter of asking for help,’’ he said. ‘‘That’s consistent with the civil rights movement. Everything we did, we went to judges to reconcile the differences. I don’t think there’s any animosity or hostility involved in it.’’

Bernice and Martin Luther King III both declined to be interviewed for this story, but issued a statement Saturday through attorney Jock Smith.

‘‘We love our brother, yet we cannot ignore our responsibility to ensure that the corporation we are all shareholders and directors of, is properly managed,’’ the statement said.