I don't have advice personally because I still need to get my 2nd baby, but my mother said I handled it will when my brother came home. They just made sure to make seperate time with me. Like my dad will take me out for an hour and mom would look after my brother and next time it will be my mom taking me and my dad looking after the baby.
My friend also had no problem, they just made him feel included and like "the big brother". They included him in the baby's activities and sometimes let him "guide" baby.