Does my nephew deserve the share of the house bequeathed to her, which was designated for whoever builds it, knowing that he, not her brother mentioned in the will, is the one who built the house?

The will of the woman who bequeathed her share to whoever renovates her house is valid, because a will contingent upon a condition of compensation is valid. Since her nephew fulfilled the will and renovated the house, he has become entitled to the bequest. The phrase "to whoever renovates the house" is considered a designation of the legatee, according to the relied-upon opinion.