helper function for descendants
helper function for descendants

cureHsu/angr,axt/angr,terry2012/angr,haylesr/angr,axt/angr,f-prettyland/angr,tyb0807/angr,GuardianRG/angr,terry2012/angr,tyb0807/angr,mingderwang/angr,mingderwang/angr,zhuyue1314/angr,angr/angr,GuardianRG/angr,lowks/angr,iamahuman/angr,xurantju/angr,chubbymaggie/angr,tyb0807/angr,avain/angr,haylesr/angr,schieb/angr,f-prettyland/angr,avain/angr,axt/angr,angr/angr,fjferrer/angr,xurantju/angr,f-prettyland/angr,chubbymaggie/angr,fjferrer/angr,iamahuman/angr,schieb/angr,chubbymaggie/angr,cureHsu/angr,angr/angr,schieb/angr,iamahuman/angr,zhuyue1314/angr,lowks/angr