It *is* chicken pox. Shingles is the same virus. After you get chicken pox as a kid, the disease never goes away, but like herpes, hides out in your nervous system to come out again when you're older. It feels worse because in the case of shingles it infects the nerve endings, making them hypersensitive.
If he infects you, you therefore won't get shingles now, you'll get chicken pox. Shingles will come out when you're his age.
If you've been vaccinated for chicken pox you're probably safe, but yeah. He should keep his hands to himself.
It can cause serious birth defects in a fetus. Just because you had chicken pox before does not guarantee immunity from it. From what I've read and heard, if you have shingles before you conceive, your baby will be okay, but catching it while pregnant is very bad.
Yeah, staying away from mommy dearest for a while...