I personally cringe every time I read the clique "two's company three's a crowd" because I don't think it's a fair rule to apply to all cases of boars. I think the case is more so "You don't have enough room to deal with three boars" or "You don't have enough voodoojuujoo to do what's needed for a group of boars."
By voodoojuujoo I mean you don't have the right instincts, time, space, patience, resources to have a group of boars.
I have a trio, but before I decided to aim for a trio of boars I did a lot of research and I was very aware from all of the unnecessary warnings I was given that I could potentially be shooting myself in the foot by adopting a third. And it's true, some people end up with little balls of hell... but there's a theory that if a pair of boars or a trio of boars isn't working, you can try adding more boars.
With all groups of boars, you need to give them an insane amount of room for introductions in neutral territory. My trio's introduction was done after a period of quarantine in neutral territory with food and hay spread all over the room. I didn't bathe them beforehand because I couldn't really be bothered at the time and decided that if things escalated to tooth-chattering stages then I'd terrify them together with bath-time.
The introduction went surprisingly well, and I'm perhaps not as sympathetic to the pairings of other boys because of that. But I have had a pair of boys who were brats to each other and with them the maintenance of them as a pair was more important than the introduction which were done as a young-older boar pair (where the older boar had been used as a breeder).
To maintain my pair/trio I make sure there are no hidey holes or places where one boy can be trapped. I'm lucky that I seem to only have one dominant boy so the two submissive's seem to overwhelm him whenever he tries to approach, this means he can't seem to decide which head he wants to hump as they both move in two different directions.
This is also the theory many groups-of-boars seems to have. The theory is that if you have, say, four boys who aren't getting along, you can try adding more and more boys (space permitting) to the pairing. Having so many boars together means the chances of one boar being singled out is less as there are so many boar-butts for a rampant-humper to choose from that he eventually exhausts himself. I'm not saying fights don't break out - they will have a go at each other - but generally there seems to be an overloading of the piggie brain which reduces life-threatening bullying and full-out-blood-bath matches.
None of the boars (or minimally) in any of the groups I read about while researching, including my own trio, were related. Also, not all introductions were younger-older. My own was a relaxed pair introduced to an older boar.
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