Final answer:
Nigel and his siblings will likely face inheritance taxes after receiving their mother's property; these taxes are a common but debated aspect of wealth transfer.
Step-by-step explanation:
Nigel and his siblings will most likely have to pay inheritance taxes upon receiving Helen's property. Inheritance taxes are levied on individuals who inherit property from a deceased person.
While there is a great debate on the legitimacy and impact of inheritance taxes, these taxes are a common aspect of wealth transfer upon death. The intention behind such taxes is to address inequalities that may arise from large fortunes passed on to beneficiaries who didn't earn them. However, the topic remains contentious, with arguments focusing on both the rights to familial wealth transfer and socio-economic disparities.