Is one sinful for not visiting relatives due to personal disagreements, while continuing to greet them when encountering them outside?

It is not permissible to sever ties with relatives whose kinship must be maintained. Kinship is not limited to visiting; rather, it is achieved by anything that prevents them from being considered as severers of kinship ties. Kinship can be established through various means, and refraining from abandonment and communicating through speech is the lowest degree of kinship. One should strive to achieve the best available degrees of kinship, while avoiding anything that causes problems.