If you were Vegeta and you found out Trunks is you're son would you:
1. Go and hug him.
2. Act like he isn't you're son.
3. Say that you're proud of him.
4. You're so surprised you can't say a word.
5. Go up to him, punch him laugh and say "you're to weak to be my son!".
6. Go back to the planet you trained on and stay there for a couple of months.
7. Do nothing.