I'm not going to inform my twins about their birth order
Why wouldn't you tell them their birth order?
I think not informing the twins of their birth order is the best.
It seems like such a silly thing to lie about. Honesty is the best policy with family.
I will have to be open about it eventually, but I don't like the idea at the moment.
I just think it's foolish to hold such a small detail as a secret. I don't think they'll care much if you tell them.