Answer: No, landlord is not liable
Step-by-step explanation:
According to the situation described in the question, landlord did inform the tenants about the issue of balcony's railing that they are weak and unstable .He also mentioned that he will repair it soon.
If one of the tenant falls down before the repairing could take place then it is the fault of the tenant as they knew about the condition of railing and still stepped out or went near it , thus the misshapening took place.
Therefore, landlord cannot be held responsible for the accident because he warned the tenants about the railing as well as assured them that he will get it repaired.