What is the ruling of Islamic law regarding a husband who does not maintain ties with his relatives - other than his parents and siblings - due to his preoccupation with work, and is it permissible for the wife to maintain ties with her husband's relatives on his behalf?

Allah has commanded the strengthening of kinship ties and forbidden their severance. It is obligatory for the husband to maintain his kinship ties. It is not sufficient for the wife to maintain ties on his behalf with his relatives. The strengthening of kinship ties does not have specific methods or times; rather, it is determined by custom. Visiting is not the sole means for this; merely inquiring through modern communication methods may suffice. Kinship ties have varying degrees, the lowest of which is refraining from abandonment and maintaining connection through speech. Maintaining kinship ties is among the causes of blessings in sustenance and lifespan.