What is the ruling on dealing with the paternal cousin who unlawfully seized a portion of the father's land, which led to a two-year dispute between them?

Severing ties of kinship is one of the greatest sins, while maintaining them is one of the greatest acts of worship and obedience. Your cousin must maintain ties with his uncle and not sever them for trivial worldly reasons.

The problem of land boundaries can be resolved by reverting to the original area before the settlement, so that each party's share is reduced proportionally to the decrease in the total area. The problem can also be resolved through reconciliation and mutual agreement, or by resorting to the Sharia court. It is not permissible to continue severing ties of kinship for these trivial reasons.