?Rameshbabu Praggnanandhaa and Vaishali Rameshbabu become the first brother-sister duo to become chess grandmasters. Vaishali got the required 2,500 International Chess Federation (FIDE) ranking points on Friday at the IV El Llobregat Open in Spain. Vaishali is the elder sister of Praggnanandhaa and the only daughter of Rameshbabu and Nagalakshmi.?