Does your church have people who go forward with their arms crossed to recieve blessings? I know some would suggest this is not correct behavior, but if you position yourself behind your parents in line and you simply cross your arms when you get to the front, they may not notice at all.
If no one does this or your church is set up with the use of an altar rail, I’d just have sort of a script ready for your parents so you don’t stress too much about the interaction.
When they ask say, “my conscience is troubled about something and I’d like to discuss it with my confessor.”
I don’t know your parents, but I know as a parent I’ve probably been guilty of a little interrogation. It’s never because I want to know my kid’s sins, I just want to know if they are OK and how I can help. For example, my 8 year old told me he wasn’t going to recieve and I definitely asked him a few questions to see if he wanted me to take him to confession or if was something else. Turns out he was just really stressed out by the procedures for recieving and wearing a mask all at once.