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I am trying to find a good word or phrase to describe someone who (or the act of someone which) tries to benefit from everything someone else has or does.
The context is, on a personal level.
For example, a friend, parent or someone else tries to be included in all of the good things that come out of your hard work.
A more concrete example may be "My friend Sam is always pushing to drive my new car, stay at my new house, go out when I get paid knowing I'll pick up the tab, inviting herself and her child to any of my interesting outings for the child's benefit. Sam is ______".
I do want to make the distinction that this should not be strictly related to money. It's just one person who uses someone else's advantageous situation to benefit, at every possible opportunity. The word/phrase I am looking for should describe either that person or their act.