Tough Tilly replicas

[Messenger]

I am probably the only one that has just woken up to the fact that Tough Tilly (Ladies In Red's great rival for 2yo filly of the year last season) is 2x2 full siblings in blood in that Captain Treacherous's dam Worldly Treasure and Art Major the dam's sire have identical grandparents

I hope the attachment makes it clearer than the explanation

At the recent Nutrien Sale I noticed 4 Lots that have duplicated this duplication