Sentence:  <WSD>Primogeniture</WSD> acting as a "law" of inheritance in the case of intestacy applied in fact to all real property, however humble. Movables and personal property in this context were subject to equal division, the elder son inheriting all real property as well as his share of the personal property. 
Meaning of the word marked with <WSD> tags:  The principle that the eldest child has an exclusive right of inheritance.