You have to use Friendly interactions with the Sim with whom you want to move in until it says "[Other Sim's name] thinks [your Sim's name] is being sociable." Then, the Ask to Move In interaction should show up.
If you know that your Sim and the other Sim have any traits in common, I would recommend using interactions related to that trait if possible. It makes it faster and easier to get to the "Sim A thinks Sim B is being sociable" point.
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if you want someone else to live at your sims house in sims 3, go to edit town, and then choose the household and click on the other household you want them to merge with.
if you know who the maid is then you could invite the maid and the baby to live with you and then only kick the maid out
You go to your phone in your house and invite someone over then you choose the person you would like to move in with you and when they get there, if they don't reject you, you go to actions( when you click on them) and then there you go!!(: hope I helped
Yes you can If they are your romantic interest then there is the option to go on a date when you click on them. Also if you invite someone round and do a romantic interaction it will automatically make it a date.
You just need high speed internet to do a live stream on the SIMS 3.