Chestnuts?

as far as I know, they are tree nuts.

yes
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Chestnuts are tree nuts, but my understanding is that the primary reason for a PA person to avoid tree nuts is cross contamination. I wouldn't be worried about chestnuts, at least the ones sold in the shell, because the chances for cross contamination are pretty slim. But, it may be a comfort zone issue.
Also, chestnuts are different from most tree nuts in that most nuts are primarily fat, and chestnuts are primarily carbohydrate. Not sure if that would make a difference in the allergy-causing protein, but they are unique in the nut world. It's moot for us since I would have to tie my daughter down and force her to eat a chestnut, but at least my husband can eat them without worrying.

Chestnuts are very popular here in Korea. Everywhere I go, especially during this time of year, there are street vendors selling roasted chestnuts out of the back of trucks. People love them. I haven't tried any, mostly because I think they smell yucky, but they sure are beautiful all piled up in huge shiny mounds--they look like dark polished wooden beads. I should try some. I don't know if my PA son is allergic to tree nuts, so we avoid all tree nuts for him.

My son is PA and soy, but was tested in the clear for nuts. We do avoid nuts anyway. I have fed him chestnuts in a brain-dead moment. I had baked the Chistmas Log myself to avoid allergies, and there I was putting chestnuts in it! DUH!
Thankfully no one reacted.