tenant trouble not sure about liability

[Susan Clark]

Tonight I was texted and called by my tenant. his daughter had been visiting the single family rental they live in and fell down the porch stairs and broke her wrist. It was raining and the stairs were damp.  The tenant has said the steps were slippery in the past and each time we have gone and addressed the problem. Tonight I mentioned the tread strips we applied earlier in the year and he said he took them off because they too didn't work and water pools in the steps. there is a railing on the stairs and it is firmly in place (we fixed that earlier last year). Am I liable for this incident? Who do I go to to ask or protect myself.

Thanks