To marry someone from a different house you first have to make your sims fall in love with each other. then click on the sim from the other house and find propose. tada! that should do it.
You make them be nice and romantic to each other
They have to like each other on a love level and then you should have a option to marry them.
Get them to break up with their old partners first.
You have to have sims from different household and they have to be 100% in love with each other, then in time the option 'Propose' will appear.
You make your sims best friends,
i dont no tryin 2 find out my self
Yes
In the Sims series of games, your Sims won't want to fall in love until they know each other well... so you have to get your sims to have conversations with each other, and know each other really well, and that will open up additional "love" options, like giving them a hug. :) If you take it slow and don't try to push them into it too fast, you can usually get any two sims to fall in love with each other.
it should be like the other Sim games. just get them to fall in love and that the smiley heart
They can if they are in love,and you have nightlife...
Sims can only fall in love with a Sim they have met, if they don't each other they will have no relationship.