Father remarrying.. need advice

What is the name of your state (only U.S. law)? NEW YORK

Basically, my mom passed away last year. My 70 year old father remarried recently. They did not sign a prenuptial agreement. I am gravely concerned because he went to China to find a wife 12 years younger than himself after speaking on the phone with her for 2 months. And people there are known to marry for fraudulent reasons (green card, money). I highly question her motives for agreeing to marry my very short, unattractive, and much older father.

I am currently the sole beneficiary on his will. The only real asset concerned is the house.

My questions are, if/when my father passes away,

How does his second marriage affect the will?
Can his second wife contest the will?
Will she have rights to the inheritances?
What will she be entitled to, if anything?
Do we need a living trust in this case?

Any additional suggestions and advice would be greatly appreciated. Thank you.

BTW, He thinks that the will "takes care" of everything. That I don't need to worry about the woman taking any part of the assets in the future. So, it's not his intention for her to inherit anything.