Badi Doooor Se Aaye Hai S01 E449 Vasant's Nightmare

Manav arrives at Ghotala's residence and again asks them to tell the truth to the colony members. Alien family follows his advice and tell the truth but they avoid giving them the reason as to why they had lied about Varsha's preganancy. Colony members now have a topic to ponder. Why did the Ghotala's lie?