Since you asked, I'll offer a suggestion to get the ball rolling for OP since his wife has shown interest to better their marriage.
For a man to have power he must 1st display it through his leadership, a skill set that empowers his family to aim for greater heights.
Previously I said, head to the beach, this is an example and let's use that example to explore on how he could display his leadership through empowering his wife and daughter with them feeling wanted, appreciated and being all around happier.
He could then replicate this example the same way or in other facets of his leadership.
I'll make it step by step for good order and easy understanding.
1. Gather the family for dinner.
2. Inform them that you're decided to take a trip the beach and have a BBQ, attendance is compulsory.
3. Partition out each work the wife and daughter needs do in preparation of the BBQ, prior to leaving the house.
4. The above 1 - 3 steps is where you exercise ur "head of the family" dictatorial powers. If the wife or daughter makes moves to subvert that power, brush it aside by simply saying "the family that plays together sticks together", now they have nothing to counter that.
5. From hereon only express ur leadership of empowerment.
6. Hold discussions with both wife and daughter on how to make the day trip to the beach a success.
7. Ask for suggestions, allow their imagination to flourish, encourage it as they give ideas, let them feel wanted and important.
8. As ideas flow in, pick one that YOU think amuses you most, then encourage whomever gave out that idea by asking more follow up questions, let them think on it and provide the resources - this will make a person feel needed, appreciated and all around create a good vibe.
9. Replicate No. 8 on another idea until you have sufficient 'games' for the day trip to have fun.
10. Now partition out the plan for games and entertainment (for the day trip) to ur wife and daughter, granting them powers to execute it, offering them resources, time to prepare and only when asked, ur guidance but never instruct - remember that. Allow them to take ownership of said task.
11. End.
All the above is a display of power.
Is it hard?
Or easy to accomplish?