Parents know they twins apart

Why do ppl think parents don’t know they kids. My twins couldn’t be more different Today I had my sis tell me my son Sawyer was rude to her I laughed and rolled my eyes and said nah that was Wyatt she continued to tell me it wasn’t so I called my boys into the room and asked who told they aunt to go away and guess what it was Wyatt she then try tell me they are lying for each other lol no no sawyer is shy reserved and won’t even say shut up she continue to tell me I don’t know my kids and they lying and I’m like yea ok sure I don’t know my kids 🙄 and then Wyatt says “ momma I said it because she kept kissing my head. She again said they lying and I was like nah because sawyer would of asked nicely for you to stop. Now they do look exactly alike in ever way but I do know my kids apart I even know them apart by just hearing they voice and not looking at them.