lol! I take full responsibility for leading you into the wild and wacky world of Simpe.
Believe me, I know how to do the things I know, and all the other stuff, I haven't got a clue what it's for!
But I do know how to launch the programme.
Go into the Simpe folder, and look for the file called SimPe. It's an application. Here's what it looks like in my folder:
You can create a shortcut to it on your desktop. Right click on the SimPe icon and click copy...go to your desktop and click 'Paste Shortcut.' You do need all the other stuff in the folder to make it run.
Now...I shouldn't discourage you from learning SimPe, however, a much easier and quicker way to make those familial links is with
Two Jeffs' Sim Blender.
Get the active sim to click on the 'family' menu and it has the options for most relationships with all other sims on the lot (household members or not). Any adult or elder sim can be made the grandparent of any sim up to teen...and (I don't have my game open now) but any elder should be able to be made the grandparent of an adult, but certainly a YA.
The relationships will show up in their family tree and in SimPe. The Blender also has a slew of other very useful features like setting relationship scores, settling and removing relationship flags, adjusting motives for the active sim or everyone on the lot, changing appearance and plastic surgery of anyone on the lot...it also had the features of IngeJones' teleporter, which allows you to teleport any sim into a lot, among many others.
It looks like the Maxis no fuss ficus plant and it's in Misc...Misc in the catalog.
I'm standing by for further quesioning