Searching for the structure "that which", I saw in this site "that" refers to the noun coming just before it and "which" is usually a relative pronoun. However, I still cannot understand the following sentence:
It has become part of your system because of your liking for Uncle Charlie, which has produced in you a tendency to incorporate into your life that which is his.
When I changed "that" to "life", it became "life life which". I must have missed something, but what?