We neuter all our boys and we only bond boys too old to be neutered, we neuter up to 5 years old. We only bond with very young babies, not adult boars, as it has the best success rate. When they leave mum at 3 weeks is ideal.
Your boy would need to come in for a few days bonding (£30 fee), you can meet the babies and we’d match him up, at this age they always get along. During his stay we would check the bond was stable and baby is growing well. Then you can pay the adoption fee and complete an adoption form, before collecting the pair.
When baby is big enough, (over 500g) they would both come back and stay at the Nest for a few days. Baby will then be neutered (no cost, this is covered by the adoption fee). This can be done at a time to suit you, within 6-12 months of adoption. Going forward, when baby ends up alone he can easily have girl friends.
You can find the adoption process here