The dispute
Partition of an estate requires the consent of all heirs or, at least, their participation in a procedure that establishes the estate, values the assets and allocates them. When one of them will not sign — over a disagreement on valuation, a prior dispute with siblings or as a blocking strategy — the matter stalls at the notary and the banks.
In practice, the heir who will not sign usually raises objections about the inventory, the surviving spouse's usufruct, the gifts to be imputed or the share due. Without an orderly legal response, the other heirs assume 'it will have to go to court' without knowing the timescale, cost or real likelihood of success.