Vaishnava Dharmashastra 18.22

18.22

atha brāhmaṇasya kṣatriyasya vā kṣatriyaśūdrau putrau syātāṃ, tadā taddhanaṃ caturdhā vibhajeyātām ||

Again, if there are two sons of a Brâhmana or a Kshatriya, and the one belongs to the Kshatriya, the other to the Sûdra caste, they shall divide the estate into four parts;