They've been granted regular visitor visas in that case. Not super visas.no it is V-1 visitor and multiple but why? they didnt gave super visa?
what is the difference?
Some possible reasons why this happened:
1. They did not select the 'Super visa' option in the TRV application form, OR
2. Your brother does not meet LICO to host your parents on super visas, but your parents have demonstrated strong ties to be approved for TRVs, OR
3. They stated a very short duration for their visit (Read: <6 months) which does not require super visas