I'm not telling my wife that I have another child through sperm donation because she gave me a hard time about my first donor child.
Could you explain why you got a second child through sperm donation if your wife didn't approve of the first?
I think it would be fun to watch my wife's reaction when she finds out.
Everyone keeps small secrets from their partner, but you should never hide the fact that you have a child from your spouse. Even if your child was conceived by a sperm donation, it's important that your spouse is aware that you have a kid out there. If you hide that from your wife and then she finds out, she isn't likely to trust you ever again.
I didn't want her finding out that one of my kids is a product of sperm donation.
It's honestly pretty sad that you want to lie to your own wife, and that could spell destruction for a marriage. A lot of people would tell you that the key to success in a marriage is honesty, are you trying to ruin yours by lying?