Ii was playing TS2 and i was saving and quiting and my compiter crashed and i went back into the family and the family kind of semi-saved?
Tthis family is the Ottomas family and the twins disappeared and dont exist on the family tree and everyones ags are bugged. It says they are elder, adult, teen, child. But their model is of their previous life state (when i first played the family). So i have two missing sims and weird ages.
I looked at the family tree but the twins are not there its like they never existed?
I went into a different family to see if i could teleport them and they arent there, however Samantha and Peter have memories of having them and the memories are Subject$.

That's...pretty bad. I hope you have a recent backup? Because that's far and away the easiest solution.
The most likely thing to have happened here is that during the crash your computer lost data, including some but not all of the data on the twins. If that data in unlinked it will be difficult-to-impossible to recreate it; if it's actually gone, then, it's gone. You could probably jump through a few hoops and fix the age problem, but missing or corrupted data? Nope.
If you don't have a recent backup, I am sorry for your loss.

oh i tottaly forgot i posted this i didnt have a back up i eventually gave up on the hood i was creating. thanks anyway.

Check that your antivirus is set to not look at Sims 2 files. I had one mess up ageing once and had a lot of 'had $Subject' memories for babies who had disappeared.