If the housemates have a single brain cell left

They will evict Rajat by HMs vote. If they evict Chahat, that will mean Shrutika will get evicted by audience votes. If the family group uses their brain, they can protect her and convince the house to evict Rajat who is anyway the bigger competition to all.

Chahat is going this week that’s for certain but they can turn the game on its head by evicting Rajat

He will never be evicted by HMs vote.