4 total. One is a desktop we don't use though. It's about 8 years old.
Lets see... I have my desktop, my son has his, my 8 yr old and 6 yrs old have thier desktop that my son built, my dh has one and my oldest dd has her laptop so 5..
1 newer computer2 older laptops1 older netbook
2 desktops and 3 laptops