I feel rather awful rn. My husband and I often take our toddler walking in the neighbourhood. There is an elderly man who would wave to our son if he happens to pass by. Today my son fell (nothing bad) and cried. The elderly man was passing and stopped to chat a bit for the first time. I was very anxious bc my son scraped his forehead a little and I'm a first-time mom. The man cheered us up by lightly saying this would not be the last time. He proceeded to talk about football (the European cup is on and we currently live un the host country, lol) and that when my son is bigger he might play football and this would involve falling too. I lightly asked if he already had grandkids. He suddenly looked rather sombre and said no. I said "okay" with a smile (but starting to realise my error), and he proceeded to say that both his siblings had each a kid who died young, and he and his wife decided not to have any to avoid heart break, bc two losses in the family were hard. I said, "I'm sorry to hear that." Then we said a few more banalities before he said goodbye. I now feel I shouldn't have asked. The last thing I want is to trigger him into remembering bad memories. I was only trying to make a friendly conversation and to show my interest. I'm from Asia and it's a normal think to ask there, but now I'm not sure about Europeans or Americans. Is there any social convention not to ask this question? I feel like I've done a massive faux pas. Thanks for the insight.