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ok i have the sims 3 and world adventures and i want a mod so i when i create a family in create a sim i can make an adult sim the parent of a young adult and make a young adult and a teen siblings of each other also is there anyway to do that without a mod if so that would be appriciated just let me know if a mod can be ok

I don't think it's possible to do without mods, but you can do it with the NRaas super computer found here.
http://ts3.tscexchange.com/index.php?PHPSESSID=3194b94ba7e492a8562d46f5ac8e14bc&topic=996.0

Just create you family the way you want them, set the teen as the child of the adult, and lave the young adult alone for now.  After you have moved them in, click the parent sim, you should get a "Master Control" option.  Under that menu there will be a few options and some more sub menus, click the "Advanced" menu, which will give you the option to change your family tree.

After you're inside the Advanced sub menu, click "Add Child", This will bring up the last menu you'll need to work with, it will list all of the town's sims filed into different categories, click either Gender:Male or Gender:Female, depending on the sex of the young adult, this will display all the ladies/gentlemen alphabetically by their last names, should be easy enough to find then, after you've done all of that.  Check your family tree, it should have him or her in the branches now.

Sorry for the semi-rant/explanation, but I hope that explains everything, Good luck

i didn't see a master controls option

Ok, then head over to this link
http://www.modthesims.info/wiki.php?title=Game_Help:Installing_Sims_3_Package_Files.

And download the Resource.cfg & d3dx9_31.dll files, there are instructions as to where they go, and then try it again, that should solve the problem.

This is in the wrong section, actually. This section is for Sims 2 requests. Anything for Sim 3 should go in the Sims 3 section (Pudding Requests). Thread moved. :)

i did the that and i still don't see master controls option