Should I try and rebond two teenage male boars after two serious fights with blood? My parents keep telling me I’m being cruel and I want to show your answers to my parents. They’re currently separated
Please never re-introduce boars after a serious fight with full-on bloody bites. They won't go back together. You have done exactly the right thing. If the issue was more in the way of a bloody scratch during a tussle, then a re-intro can be tried but there is no guarantee that it will work. It very much depends on how high the grudge factor between your boys is.
Sadly when people buy boars they usually buy them for looks and not for which boys are hanging out together and are likely to be good friends - even though character compatibility and mutual liking are one of the keys to any successful piggy bond with lots of space the other one, especially when it comes to teenage boars.

If you have two dominant boys, a huge hormone spike and not enough space to get away from each other (which your standard cage doesn't provide), then you have the perfect recipe for a fall-out. Normally the loser in any confrontation would move well away from the challenger long before there is a fight and stay out of reach as much as possible.
The link
@sport_billy has given you deals in detail with all aspects of the whole issue; you might want to read it and also show your parents.
It also discusses in detail how you can go on from there. Keeping fallen-out boars as next door neighbours with interaction through the bars for round the clock companionship and stimulation is perfectly acceptable alternative. On this forum, we call them 'can't live together but can't live apart' pairs that each have their territory but are still bonded companions. We have got quite a few members with those!
You can also find more information on boars via this link here:
A Comprehensive Guide to Guinea Pig Boars