Emino, thankfully Inge already offered a good solution for you. I just wanted to mention that I also use 800x600 resolution and have finally sort of gotten used to the side-scrolling required when using SimPE. Yes, it's a pain in the rear, but it's still way better than nothing.
I often wonder how many years it'll be before those designing now are going to realize 1024x768 no longer works for their aging eyes.
I also believe that relationships can be set using Insimenator. I am only just now putting it in my game so some of my Uni students can get married (no, I'm not going to let them have kids, LOL) so am not familiar with it, other than what I have been reading at
www.insimenator.net