Children with nut allergies

Hi,
Anyone has kids who has nut allergies ?

I would like to know the following:
1. If you have multiple kids, do all of them have similar allergies?
2. Had you done any precaution during 2nd pregnancy to avoid nuts?

My son has nut allergy. During my next pregnancy, I want to do whatever I can to prevent it happening to my next baby. But I don't know what I can do.

(I do recollect eating lot of nuts during my first pregnancy, hence I am planning to avoid nuts from now on)

Any help is appreciated.
Thanks,
Mythili