my daughters seperated from her sons partner due to DV & coeersive behavior .. so she is reducing contact ... so im the pick up and drop off point !! last weekend he dropped my grandson off and had given him a bottle of lucozade sport to drink !! i reported this to.my daughter as she had a right to know !! my grandson was exstreemly hyper ... so she messaged him to tell him its not a suitable drink to give a toddler ,,, he proceeded to messaged me to say how dare i bad mouth him .... dont you dare question my decisions .. he also said that if my daughter carries on speaking to him rudely that he reduce the amount he pays her for maintenance
need advice please