Do I need a trust?

My father re married and plans to leave all his assets to me and my brother when he passes away. He also plans to leave one of his properties to his current wife.

I am just wondering does he need a trust or anything else to ensure this happens so his current wife doesn’t try to take more than what he wanted to leave her?

Not sure what the laws are but just want to make sure my fathers wishes get carried out as he wanted in the event he passes.

Tia!