I know Macs have a relatively low infection rate, but it could well be worth installing a free AV program such as this from Avast
avast! Free Antivirus for Mac | Security Software for Apple OS X It'll only work with the newer OSX versions though - older versions may have to make do with Avira or Sophos
I'm not sure what the best AV solution for your iOS devices is - most of the "free" AV solutions for Android phones are pretty much useless (with the notable exceptions of Avast and AVG) and I don't believe the situation for iOS is any better - in fact I don't think either Avast or AVG have a suitable AV program for iOS.
Of course many will claim you don't need protection on an iPhone or Ipad - but that sounds a bit like a "titanic doesn't need lifeboats" theory to me.
Closest thing I can find are a couple of supposed secure browsers such as this from AVG to prevent against hijacks
AVG Free | AVG Family Safety | More than just Parental Control
Wait and see if Mixture has a view