Hi😊!
No there are not siblings.
Prithi is orphan raised by Sarpanch (meera's dad) whom he calls as daata.
Meera is daughter of Sarpanch. her parents are separated. sarpanch's family members consider them( meera and her mom as dead; died due to drowing) but i think her father knows she is alive. he recognized meera's mom's voice in phone without her speaking. i believe some past story is involved here.
hope this was helpful😊