Hi!
I am very sorry for your loss.
Death, Dying, Terminal Illness, Grieving and Bereaved Companions: Information and Support for Owners and Their Children
What you are planning is unfortunately the perfect recipe for fights and a massive fall-out.
You an either have each boar living in a cage each with a sow of their own as two separate pairs or just leave your boys as a stable pair. Two boars with a sow is a BIG no-no!
Neutering in guinea pigs only takes away the ability to make babies but it doesn't change their personalities or their social behaviour (including mating).
Guinea pig society is wired for a group of sows to choose which 'husboar' (singular!) they want to associate with. Bachelor boars outside these core groups can associate with each other in a looser, much less formal and often much more fleeting setting; but you cannot mix bachelor and core group settings within a standard cage without causing real problems and no way for the loser of the contest to move away into a different territory of his own - with means inevitably fights or bad bullying. This is much more pronounced when you introduce sows into a boars only space.
If you want recreate a mixed gender setting with more than one neutered boar and any number of sows or with a bigger group of boars only, you need quite literally oodles of space in order to allow piggies to have their own territories and losers of contests to get away from each other if needed. You also need suitable personalities to not cause a rampage and and constant upset. You also need to have a space you can transfer problem piggies to and have options in case group dynamics, which continue to evolve, take a bad turn at some point or other.
Please take the time to read the guide links below; you will find them very informative and helpful for thinking things really through and then making a decision that is appropriate for your personal resources in terms of space and finances.
Adding More Guinea Pigs Or Merging Pairs – What Works And What Not?
Neutered / De-sexed Boars And Neutering Operations: Myths, Facts and Post-op Care
A Comprehensive Guide to Guinea Pig Boars
A Closer Look At Pairs (Boars - Sows - Mixed)
We all have our dreams but sometime we have to wait a long time before we are able to realise them. I waited for 3 decades before I could finally make my childhood dream of a big piggy group come true but had to be practical when a piggy generation down the group started to fall apart.