Are F2 Labradoodles Hypoallergenic?

My family had a Labradoodle in the early 2000s, and she was a cute dog that everyone what to cuddle. Interestingly, she was hypoallergenic, and my dad, allergic to dogs and cats, had fun playing with it. Are F2 Labradoodles hypoallergenic? I don’t believe this breed is hypoallergenic because I have seen friends with F1-class…