Ok, after watching Offspring last night, something has been brought to my mind again ...

I have a friend whose bloodtype is B, but their parents are O (mother) and A (father).

Conventional wisdom says that their dad actually cannot possibly be their biological father ... but they refuse to ask their mum about it ...

But I wasn't watching Offspring carefully at the end of the episode, so I'm unclear as to whether or not my friend's dad could actually be their dad ...

My friend was a homebirth, so the mum is definately the mum

Anyone know the answer?

I will of course respect my friend's decision not to pursue the matter, but I am really wanting to know ...

If nothing else, so that if they ever do decide to sind out, I can be available to support and answer Qs if and when they're ready to talk about it with someone other than mum and dad...

Anyone know?