About as close as you will get is to instaniate a class object within a class, then provide functions that will interact with the instaniated object. Or, create intermediate classes.
class2 inherits form class1.
class3 inherits from class2, ect. The end result is class3 inherited form both
class1 and class2.
You end up with a few more classes, but it tends to serve the purpose in most cases.