On a side note, please make sure that your dad is willing to pay for any vet fees. That is one of their rights - access to good healthcare. And also make sure you get a pair of boars (trios or more rarely work) or sows. Piggies are very social animals and shouldn’t live alone - they always need the company of their own kind. Lastly, search for (good) rescues rather than getting from a pet shop. The former will have been health and sex checked. No chance of getting a pregnant piggy or mismatched pair (intact boar and a sow).
Good luck and feel free to ask if you have any more questions ☺ You can browse the forum for ideas on cages, bedding, food etc.