I am both new to FileMaker and I am not a programmer/developer,
Bear with me. I'm going to post something pretty technical, but I'm also going to include links that you can click to learn more if a part of what I post doesn't make sense and feel free to use Post a new Answer to post follow up questions on parts that still do not make sense.
First, the relationship you should have for your portal:
LayoutTable::anyField X HouseHolds::anyField
For an explanation of the notation that I am using, see the first post of: Common Forum Relationship and Field Notations Explained
I'm calling the table you'd use for this layout "LayoutTable" and the table that stores the details for each Household and the table on which your portal is based, HouseHolds. We'll only need one record in LayoutTable for this to work. You can use literally any field in LayoutTable to match to literally any field in Households to make this work. But you have to double click the relationship line to open a dialog box where you can change the = operator to the Cartesian join operator: X. This matches any record in LayoutTable to all records in Households.
To show the details that you want when clicking a portal row (or button placed in the portal row), we'll need to add a second relationship from LayoutTable to a different Tutorial: What are Table Occurrences? of Households.
LayoutTable::_fkSelectedHouseHoldID = HouseHolds|Selected::__pkHouseHoldID
With this added table occurrence and relationship, you can add fields from HouseHolds|Selected to your layout to show the detail fields that you want to the right of your portal. You can then either add a button to the portal row or select all the fields in the portal row and use button setup.. to turn that group of objects into a button. The button can perform this simple script:
Set Field [LayoutTable::_fkSelectedHouseHoldID ; HouseHolds::__pkHouseHoldID ]
When Setting up Set Field, there are two Specify buttons that must be clicked. To get Set Field [Table::Field ; Expression], add set field to your script and click the first button (specify target field). Select Table::Field from the list of fields. Do not click the specify button next to the repetition box. Click OK to close this dialog box. Now click the lower specify button (calculated result) and create the expression to the right of the semicolon (;). Do not try to type in the semicolon.
Thank you so very much. That works wonderfully!