How can a owners be appraised more

In 1966 the interest ownership split from husband and wife,to dad and three of the sons same ownership as the others was and still is appraised for ten times as can this be

Are you talking about a mineral appraisal for estate purposes? Or tax purposes? Which state?

Most likely the tax assessor misplaced a decimal point.

I'm talking bout from the first time appraisal notice original record of appraisal on oil interests one siblings Texas appraisal being ten times the value of others put it this way original appraisal www as 1000 thousand something now fifteen thousand and the others was 300 now 3000.