Just type in ctrl+c then once you have the cheatbox opened, type:
TestingCheatsEnabled true
then go to your sims relationship status with the other sim and drag it up, it's very delicate so you have to grab it perfectly to drag it, so it may take a few tries.
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No there is not a cheat to make a sim pregnate on the sims 2 for ps2
If your sims are already best friends, flirt with or kiss them. If not, get them best friends while flirting/kissing them
As far as I know, there is not a cheat that can make sims younger again. Sorry.
ewww and no, not unless their related by marriage. But you can make sims have the same last name even if they aren't made at the same time. Then you can have a Mr. Smith already in the neighborhood and create a Miss Smith. Move them in together and have them fall in love.
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.