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why doesnt owen and beru remember r2 and 3po in episode 4 i mean they lived with them for a few years i mean does everyone get their memory erased

There are a lot of protocall and astromech droid in the galaxy. they are so comon place that the have no reason to remember them. R2D2 does not live with the Lars family. Just 3PO.

oh yeah

plus it is 10 or more years sense they had seen them.

Maybe they do remember them but they dont want to say anything to C 3PO about the past just in case he might remember or something like that.

In addition to what jedijunky1138 and darktim1 said, Owen knew what type of droid 3PO was when he saw him and knew he probably had no use for a droid like him, most likely from his previous experience with a protocol droid. unbeknownst to him, this is the exact same droid with newer coverings. Plus, the day the R2 and 3PO were purchased from the Jawas, Owen didn't spend too much time with them. He had Luke taking care of them. The only time Owen saw them was when he bought them. Then, Luke left with 3PO early the next morning to find R2, before Owen woke up, so we pretty much saw all of Owen and 3PO's time together on screen. Owen and Beru really didn't have a chance to recognize similarities in the droid they once had and the one they just bought.

And when owen realized that the droids were looking for kenobi, they recognised them. Realising who the droids were, he ordered luke to have the droids' memory erased.

VERY GOOD POINT! You can almost see the recognition in his face.

But u can't actualy see any recognition in his face, 'cause GL probably didn't know that 3PO had met Owen when ANH was made.

then maybe the actor who played owen was a guy who could see into the future

aah, that explains it. And it's so obvious.