Has anyone experienced extreme sibling rivalry. Eldest boy is 3 in November, youngest boy just turned 1. Eldest is very aggressive towards sibling, won’t let them touch toys without hitting them etc. he completely ignores his brother in all other scenarios and won’t even give eye contact. Nursery have commented on it too. Anyone else have this and have any tips? I’ve tried giving him tasks for baby but he says ‘no I won’t get the nappies… no I don’t want to help’ etc