Small things, but amazing to us.
Yesterday DS2 came into the kitchen naked from waist down (not unusual!) I said to him 'DS2 bring me your trousers'. Off he went. DH and I looked at each other, I smiled and said 'He'll forget by the time he gets there, or he'll be distracted by the TV'. Next moment, DS2 reappears carrying trousers and nappy.
This is the first time he's EVER brought something to us on request from another room. And he had to walk through two rooms to get there, not be sidetracked by Fireman Sam, come back and give the trousers to the right person.
Then today we were in a toy shop. He picked a football out of a big wire basket, bounced it to DH, said 'ball, ball', then held his arms out and said 'catch'. We were so excited (didn't realise quite how much until the manager came up the stairs, obviously to check on who was making the strange shrieking noises ).
No-one in RL (except family) would understand how important these things are - but I know you lot will!