Looks like u guys are really stuck! Let me help Xx
To get past the partner thing is easy so don't worry.
When you are partners you just have to keep filling up the pink bar until an option comes up saying, get engaged.
Click on that! Yes, the rings are quite expensive. You can pay in life points or simoleons.
I usually pay with life points. Remember that the more expensive the ring you get the more likely they are to say yes. Alternatively if they say no you will lose that money or lp...
When you are engaged fill the bar (sometimes its already filled) until it says get married.
Just click on that and all you will do is kiss basically. But you will be married.
When you are married get a cot (also costs you lp or a lot of simoleons I use lp) and when you get it you will have an option with the plus person sign on it to add a baby to your town. Again charging you for the life points but there you are.
And just for people posting, the date and time money cheat doesn't work any more so please stop posting it...
Plus I am on level 8 with two babies and married parents.
Mmm I don't know where you get it from. Hope this helps (but it is pretty obvious) Xx