The state Supreme Court on Monday handed a setback to a group of siblings fighting with their father and uncle over the family’s multibillion-dollar fortune from a major pest-control conglomerate.

At issue are trusts established by O. Wayne Rollins, the late patriarch of the family and the co-founder of Rollins Inc. Four of the nine grandchildren who were to benefit from the trusts sued their father and uncle over their shares of the family’s money.