Tommy & Gina are Jon's brother and his Girlfriend. Which one exactly, I don't know, I'll leave that to backstagers.
But yes, Jon explains it at concerts throughout the time when the MTV thing happened in 1989. He fully admits its about his brother. Jon further explains his brother's girlfriend moved in with them.
If you've ever listened to "I Don't Want To Live Forever" there is a lyric which is something like "My brothers' girlfriend's pregnant and, today she's moving in"
Anyway.... If I'm wrong. Go to hell.
RUN
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