My wife taught my son to ride a bicycle for the first time while I was at work. I'm really upset with her for doing that.
Why are you so upset about your wife teaching your son to ride a bike?
I wanted to be there when he learned how to ride a bike for the first time.
I'm sure your wife didn't know how much it mattered to you to share that experience with your son. She was just trying have a fun day with your son. You shouldn't be upset with her for what she did.
She should know how important that was to me.
As your son's mother she has the right to do what she wants with him. You should talk to her and tell her the experiences that you want to share with them. No harm was intended in this situation.