1) Use a Core-Mod such as Pescado's Awesome (google: MATY) or BaXiM's CORE (available at sexysims2.com)
2) Use a combination of MasterController, Woohooer, and PortraitPanel (available via the link in my signature)
NRaas Industries: Sims 3 Mods for the Discerning Player, hosted by The Wikispaces.
thanks a lot for your advice, but i don't have any idea about how to activate the "+ than 8 sims" in the mods...
You don't need to activate. If you installed the mods correctly, you should have it.
You still cannot create more sims in CAS, don't be mistaken. However, in assumption you want to create a big 20 sim family, you have to create them with separate households then move them together into 1 single lot. Previously TS3 will tell that you reached max limit, but after the mods, you can move in an insane amount of number of sim (100+ I heard, although, don't try).
And if you must link all the sims together in the family tree, this method only gives half the solution. Ask me again if you want to know.
I work for a living, but I don't necessarily live for a working.
just one that will work. only have base and WA also want to have thumbnails for more than 8 if possible as i downloaded a household with 108 ppl in it 105 of which are infants a toddler and the parents and it crashes sims when i play it