I own all of the Stuff, Game and Expansion Packs that are currently available on Origin (28 February 2021)
To have the Squealing Mermaid Boathouse lot in your game as depicted in the previews, you will need: Get Together, City Living, Cats & Dogs, Seasons, Get Famous, Island Living, Jungle Adventure and Back Yard Stuff.

Upstairs I removed one wall piece between the spare room and the landing. You can leave it open or just close it off as intended.
If you plan to place the rooms I did for this lot, do check for double windows, doors and all things that are attached to the walls, inside and out. The entry for instance, with kitchen and living rooms placed, add up to having 3 or 4 doors and arches on top of each other. The rooms mostly have double windows. Nothing I can do about it, just use the bb.moveobjects cheat and delete doubles.

I used the cheats bb.moveobjects, bb.showhiddenobjects and debug. Please use at least the bb.moveobjects before placing the lot. After downloading and installing, the rooms can be found in My Library, under the Advanced tab. Make sure to check include custom content.

Credits: My fellow TSR artist friends

• Value: 38882
• Furnished: Partly
• Decorated: Throughout
• Bedrooms: 2
• Bathrooms: 2
• Stories: 2
• Lot Size: Other
• Custom content: CC used