Yes. Basically, my dad knocked up a girl when he was fifteen. Mind you, he had me when he was seventeen. Though the girl didn't want anything to do with my dad so she told her current boyfriend that it was his and he didn't question it to the best of my parent's knowledge at least. For the past twenty-four years, he has not spoken to this girl so that her now-husband never knew that it is actually my dad's kid.
'o'
Did they explain why it was a half-sibling, at least?
'-'
*huggles*
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