Legal Question in Wills and Trusts in California

It depends on what the will says happens to daughter's share if she predeceases parents.

It depends on the terms of the will. The parents' wills may provide that their daughter's share goes to her surviving husband, or they may provide for him as a beneficiary directly. However, if you are asking whether husband's marriage to their predeceased daughter means that he has a right to inherit her share of her parent's estate, the answer is no.