Bringing baby #2 home

Amiyah

Okay Moms I Have a super spoiled 2 year old boy and when I say spoiled I mean me and his dad can kiss and he will throw a Fit screaming No My Daddy ! And Vise Versa I’ve been keeping my younger niece more often so he can get the feeling of having a baby in the home but he throws tantrums if I pick her up snatches toys and even takes her bottle What should I do to prep him for his new brother or sister ? Negative comments will be removed and ignored !