"His mother has three daughters."
Translation:उसकी माँ की तीन बेटियाँ हैं।
हैं is 'are', not 'is', but other than that yes, this is the literal translation. In Hindi 'to have' is only used for objects (and I think animals too) so the way to say "I have a brother" is literally "My brother is". Just a quirk of the language.