If the bunnies are not actually living alone with you, but rather in your family’s home, they are really the responsibility of both you and your parents, and that may mean that in just a few years your folks will have them permanently without you. That’s a big obligation for them to take on.
A bonded pair (bonded, not just 2 from the same litter who haven’t reached puberty yet) needs to stay together, and 3 is a difficult and tricky bonding relationship. The neuter question has been addressed, but I would rather see you let someone take a manageable pair of bonded bunnies together, and you go and find a mate for Pablo when the time is right. He will bond with another bunny he chooses himself, and it will still be a lot of work. His presence may upset the current bond as was mentioned. I’d resist the urge for now until you have the sense that you are going to have several years of a home for yourself and one or two speutered bunnies. He won’t be lonely if he has your attention morning and evening.
You can honor your impulse to help by researching rescues where you could volunteer.