If, During one single day, Your four year old child accused you of hitting them several times, And then said that their Dad and SM (Who child lives with) also hit them, (Goes into specific detail of this but changes story three times), And their Dad refused to discuss it further than 'I don't think there is anything effecting her' What would you do?
Keeping in mind that; You have certainly never hit them, The child has never had any suspscious bruises or marks on them, has never displayed any sign of fear about either parent or the SM, And that there are circumstances that could be causing the child to be anxious or feel pushed out - Namely the arrival of new sibling, coinciding with SM suffering a second trimester miscarriage (Child knows about this) and now being pregnant again (Child has said that she believes this baby will die too, that SM will die, and asks if her new sibling will die).
Who would you talk to about this if the father absolutely refuses to discuss it with you. Even if you don't believe the accusations, Wouldn't you think that behaviour like this is something that needs looking into? That the child is obviously feeling something to even say these things?