What is the father's duty towards his daughter who demands her share of a house built jointly by both parents, especially after the mother's death and the desire of one of the brothers from another wife to occupy the mother's apartment?

If the mother helped build the house with her own money and did not intend it as a donation to her husband, then what she paid is originally her property and must be divided among her heirs according to the Sharia inheritance laws. The husband gets a quarter, and the son gets the remainder, unless there is another heir. It is advisable to refer inheritance matters to the Sharia courts for a precise investigation into the existence of heirs, wills, debts, or other rights that may take precedence over the heirs' rights.