Islam calls for the upholding of the ties of kinship because of the great effect that this has on achieving social cohesion and perpetuating cooperation and love among the Muslims.

If you want to deal with your toxic family member on the basis of justice, then it is permissible for you to respond in like to his unkind words. But if you bear it with patience, that will be better for you. If you want to turn enmity into love, then treat him well, if he treats you badly.