You can claim the total amount of tuition, or $5000, per child. So yes, conceivably that could mean $15,000 of tuition transferred to yourself. The amount of tuition available for transfer is calculated per each child. If Child A has $6,000 tuition, child B has $5,000, and child C has $4,500...then only a total of $14,500 is available to be transferred to yourself.
http://www.cra-arc.gc.ca/tx/ndvdls/tpcs/ncm-tx/rtrn/cmpltng/ddctns/lns300-350/324-eng.html
