Colgate will consider your need for financial assistance in its admission decision based on the level of your request. Since your family contribution would not be negligible, this may allow Colgate to accept you based on the substantial merits of your application. Colgate, nonetheless, remains a reach, but perhaps not an unrealistic one.
If you care to say, it would be interesting to hear what you like most about Colgate. Also, any particular reason you didn’t apply ED1?