Question:
If one is davening S”E and one suddenly realizes that he is standing right behind his rebbi/ father, what should he do?
Answer:
Some hold that only if he davens alone with his rebbi is a problem but to daven in a shule with other people is not a problem. Perhaps he should turn his body slightly to one side.
Sources:
Berochos 27b, O:CH 90:24, Y:D 242:16