where are you getting this from?
Kid is always targetting Shanks for some reason. And his whole crew seems to be on line with that goal. So there must be a reason and Connection.
But at the same time it seems like Shanks has absolutely 0 Personal Business with Kid. He knows about Kid, but not even mentioned him when he was near Wano.
So it’s either one sided reason, or a mistaking. The second one seems quite reasonable when we keep in mind about the Holy Knights, specially garling, were Part of the „Native Hunting Competitions“. About Kids childhood we know a „criminal group“ attacked his Island when he was a Child and killed his childhood friend Victoria.
For me it seems like this criminal group was indeed the Holy Knights, Garling and his golden son Shamrock.
So Kid saw Shamrock killing/taking Victoria and later just saw Shanks in the newspapers, recognized the same man. Never knowing there are Twins.