@Zahavasdad
No one has to contest anything……….
If the man dies without a will and any property (house, car, bank accounts, stocks, etc.) are titled in his name then the estate must be probated in order to LEGALLY distribute the property to heirs. Then the statutory distributions may be made.
It is NOT possible to ‘contest’ an estate distributed in this manner. One can only ‘contest’ a will. One can mount a challenge in Probate/Surrogates Court to any particular heir based on testamentary evidence or challenge paternity.