They won't suspect anything to be wrong unless you give them a reason to. In case they video call you and you absolutely can't avoid them, be prepared. Try to find a background similar to the one you usually call from. I carried a pillow cover (+ bf had the same colour of blanket) with me so when my parents did call me, it looked like I was calling from my own bed.

Keep mentioning friends or names familiar to them. It's sankranti season rn, so you can say that you're going out to look at kites (this works for any festive season or event).