Please help me with this question. FOR BUSINESS LAW

CASE STUDY:

Coby and Maya immigrate from Eastern Europe to Ontario. Coby is a medical doctor and speaks fluent English. Maya, on the other hand, speaks no English and terribly misses her friends and family back in the old country. She becomes depressed, so her husband prescribes her an anti-depressant in ever increasing dosages. Eventually, the couple separates. Maya continues to take the anti-depressant medication. The enter into a separation agreement whereby Coby pays Maya monthly support, but the amount barely covers her rent and living expenses. During the divorce court proceedings, Maya claims that she was forced into signing the separation agreement by her overbearing husband and that she was heavily sedated at the time.

QUESTION:

1. What does her husband have to prove or establish to ensure that the separation agreement is a legally enforceable contract? Will he likely be successful on the facts? Why or why not?