The expression "load mother up" refers to a concept of overload, of filling the mother with concerns that are greater than her ability to cope. For this reason, we can say that in the phase shown above, this expression means "Give mother more than she can handle".
The speaker of this sentence is concerned with the burden that the mother has been receiving through problems that other people can solve, but they do not try and end up throwing everything at the mother.
This quote is an example of personification. Having just witnessed an important part of the witches ' prophecy being fulfilled when he was named Thane of Cawdor, he believes that the rest may be soon be within his grasp. He is overcome by ambition and a desire for the...
