I'm your brother
Not every women will have same heart, some maybe strong and some maybe weaker. Husband, while exercising his right in Islam should apply some wisdom before committing to polyginy. Example, if he knows his wife is weak in heart, like the case of my friend, better he postpone his intention to have "new house". Although I favour guys to have wives if they can afford, nothing wrong to discuss the matter with his wife so that she will be mentally and physical prepared.