Methylation - really good article that helps you to understand SNPs

If you know what your or your kids' SNPs are (perhaps from 23andme or other testing) then you can use this info to work out what they may mean:

http://www.heartfixer.com/AMRI-Nutrigenomics.htm#MAO%20A:%C2%A0%20Monoamine%20Oxidase%20A