Is a house built on the land of a deceased father with his financial assistance considered part of the inheritance, or does it belong to the builder, or is it only the land that is included in the inheritance without the building?

If a father permits his son to build on his land without explicitly declaring it a gift, it is considered a loan (عاريَّة) that terminates upon the father's death. If the period between the construction and the father's death is short, the loan continues for the duration customarily recognized. The building son is entitled to the value of his construction, whether demolished or standing, from the remaining heirs. If the heirs agree upon a specific method of utilization, the matter is up to them.