Is it ever okay to tell a lie as part of a happy surprise for someone else?

This question is from Ryan (age 11) and Morgan (age 8). We bought birthday presents for our brother Sean, and we had to sneak them into the house. We wanted Sean not to know what we were doing. At first, we thought we should make up a story about why we were going back and forth to the car. Morgan thought she should tell Sean she was going outside to swing. But then we talked about how that would be a lie and she decided to go out and actually swing before bringing her present inside, that way there was no lying involved. Should we have told the lie to Sean? Is it okay to tell a lie as part of doing something nice for someone?