I did not know this until the other day. Chick peas and peanuts are in the same "family" and if one reacts to peanuts, they may react to chick peas. Also for those breast feeding, I just found out that fenugreek may also cause a reaction to those who have a peanut allergy also.
Re: peanuts & chick peas
Along with lentils, peas too are legumes. And can cause problems. But not necessarily.
I have a friend whose son can't do nuts or peas.