Toddler fighting sleep

Ladies, I'm at my breaking point. Injust can't take another day of this constant crying and fighting us to get my 2 year old to sleep. We've had a great schedule. One nap mid day, night time snack, milk, lay down and sleep. I have to force him to take his nap because if I dont, night time is HORRIBLE. If I let him sleep by himself, he'd never actually fall asleep until past midnight. Ever since i had my daughter (e weeks old) he's been aggressive during the night only. He gets mad when I console her and feed her. But I have to put her to sleep before him. His screams wake her up then her crying doesn't ley him calm down. It's a cycle 😭🙁 i really don't know what to do anymore. Anyone have tips to get him to settle down at night??