I tried rubbing her milk on him, when his sister wee'd I made sure it was on his back end too, he's only had her milk since he was born so he definitely smells of her and his twin, but she just will not feed him, I put them out on grass today and he's taken to the bottle, so I'll bring them in again tonight until I'm sure he'll come for the bottle, but leave them as a family,me seems quite happy so Far!