Vaishnava Dharmashastra 18.19

18.19

atha brāhmaṇasya kṣatriyasya vā kṣatriyavaiśyau putrau syātāṃ, tadā taddhanaṃ pañcadhā vibhajeyātām ||

Again, if there are two sons of a Brâhmana or a Kshatriya, and the one belongs to the Kshatriya and the other to the Sûdra caste, they shall divide the estate into five parts;
90. And of these, the Kshatriya shall take three parts;