Dividing OGM rights between family

I’m trying to give my family an example of how the rights look when split up. Am I correct on this? Thank you

DAWSON CO., TX FULL MINERAL INTEREST AND 1/2 ROYALTY INTEREST N/2 SECTION 7, BLOCK M, E.L &RR SURVEY, A-271 (CONTAINING 160 NMA)

WHEN SPLIT INTO THIRDS WOULD READ

DAWSON CO., TX 1/3 MINERAL INTEREST AND 1/6 ROYALTY INTEREST N/2 SECTION 7, BLOCK M, E.L &RR SURVEY, A-271 (CONTAINING 160 NMA)