What to expect...
3 times the kisses
3 times the lovin
3 times the laughs
3 times the cuddles
3 times the hysterical antics
3 times the worry
3 times the missing them when you're gone
3 times the fun
3 times the mischief
3 times the cute
3 times the most wonderful feeling in the world
My only advice is get everyone neutered/spayed. This will go a long way to having a happy household.