A gentle frailty that hides indomitability

Technically they did have another foundation establishment cultivator within their ranks, their mother. She had been at the fourth stage, but the poisoning incapacitated her. She was no different than a newborn child with how weak she was.

This only left Li Fei as the person with the highest cultivation base in that household, as an eighth stage qi refinement cultivator. But with him crippled, he was essentially just another mortal, which now left the burden to his sisters who were both younger and weaker than him with the most powerful of the two, aged twelve, being a silver body refinement cultivator. 

If the circumstances were normal, they could have maybe depended on their two aunts who had moderately higher strength. One of them was a first-stage foundation establishment cultivator and the other was the ninth stage of the qi refinement realm. It wasn't much, but it was better than what Li Fei had.