@Frank Apisa,
If I were preparing Biden, my goal would be to get Trump talking about himself... and keep him talking about himself.
Do you think Biden will bring up poll numbers

?
Biden doesn't want to talk about his family. And, Biden doesn't want to talk about the left (he would rather pretend the left wing of the Democratic party didn't exist). If Trump is prepared at all, he will take swings at both of these.