He had a dream for a family of his own.
He had a dream of a family of his own.
Merriam-Webster uses about and of as prepositions of choice for the noun dream. However, what I'm curious about is the for option in the given contexts. In my humble opinion, dream for has more emphasis on having the family in general, while dream of highlights the sort of family he was dreaming about. Can someone clarify this? Am I right, or is this just something my linguistically tortured mind made up?