Got it now. This is what you are asking for.
Marinco Shore Power Pigtail Adapter
However, powering the boat this way for an extended period isn't a great idea. Stopping over for a few hours maybe okay. The household plug does not lock in well, despite the screw, and the weight of your shore power cord has to be relieved or it is constantly trying to pull it out. I use this adapter over the winter on the hard to power up onboard battery chargers.
The other concern you'll have to deal with is your boats power draw. If she has 30 amp cables, you may overwhelm a 15 or even 20 amp household circuit. Smokey the Bear disapproves. Not all breakers will pop.
Our panel has an electronic switch, which can be set to the shore power input so it won't draw more than able. When we charge over the winter, we only have the chargers running. Nothing else and I stay there to supervise until done.