use cross\crossdata, clear
sort individid
merge individid using cross\crosseducation
drop if _merge ==2
drop _merge
save cross\crossdata, replace

use cross\crosseducation, clear
sort fatherid
save, replace
use cross\crossdata
sort fatherid
merge fatherid using cross\crosseducation
drop if _merge ==2
drop _merge
save cross\crossdata, replace
use cross\crosseducation,clear
sort motherid
save, replace
use cross\crossdata
sort motherid
merge motherid using cross\crosseducation
drop if _merge ==2
drop _merge

save cross\crossdata, replace