Brinda, Mukta's cousins, if I am not mistaken...
Yes Bala and Brinda/Mukta were cousins. Wheras the Bala was the daughter of Jayammal, Brinda and Muktha were the daughters of Kamakshi.
The link below to the Veena Dhanammal family tree is extremely insighfulhttp://www.balasaraswati.com/family.htm
Some of the dates though have typos. Like for example Rajalakshmi was born in 1885 whereas the chart shows 1985.
T Ranganathan 's year of birth is 1925 , but wrongly shown as 1825.
Abhiramasundari , sister of Brinda and Muktha died in 1974 (i think) but the date is erroneously shown as 1924.